Version 0.6.0 is a major update to Celeritas featuring:

• High-level integration utilities for Geant4 applications
• Optical physics implementation including volumetric physics
• Advanced field mapping capabilities with 3D cylindrical and cartesian field maps and volume-specific uniform fields
• Extended geometry conversion and optimization-oriented features for ORANGE
• Support for VecGeom 2.0
• Spline interpolation for cross-section calculations and energy loss

A few minor features are noteworthy:

• Improved debugging utilities for diagnosing stuck/errored tracks
• Support for sensitive detectors in replica/parameterized volumes
• Better handling of tracks that fail or get stuck during simulation

Notable bug fixes include:

• Fixed navigation and mapping of reflecting volumes for VecGeom
• Resolved crashes related to process construction and memory access
• Fixed issues with GDML file loading and SD hit scoring
• Fixed Urban MSC scattering distribution (backported to v0.5.3)

Some interfaces have been removed:

• Obsolete demonstration apps and celer-dump-data
• Macro setup from celer-g4
• The ability to run on the default stream

Known deficiencies:

• Surface optical physics (reflection, refraction) is not yet implemented
• ORANGE performance is significantly degraded compared to v0.5

Changes since v0.5.0, excluding those released in v0.5.3, follow.

New features

• Add optical "locate vacancies" and pre-step actions (@amandalund, #1441)
• Extend debug utilities for stuck/errored tracks (@sethrj, #1451)
• Add CELER_NONFATAL_FLUSH to cleanly kill stuck tracks (@sethrj, #1455)
• Add optical absorption model with imported data (@hhollenb, #1440)
• Add multilevel "volume instance" (@sethrj, #1461)
• Reconstruct Geant4 navigation history from stack (@sethrj, #1466)
• Add "cut" for individual track steps (@sethrj, #1467)
• Improve error checking and diagnostic output for managing GPU (@sethrj, #1464)
• Add distance-to-bbox function (@elliottbiondo, #1446)
• Add multi-level state to detector step result (@sethrj, #1471)
• Override and save Geant4 dataset variables at configure time (@pcanal, #1475)
• Implement spline interpolation for cross-section calculation (@lebuller, #1444)
• Implement optical Rayleigh model (@hhollenb, #1469)
• Allow core and optical loops to have different numbers of track slots (@amandalund, #1491)
• Add muon decay interactor (@stognini, #1456)
• Add option to use spline-interpolated energy loss (@lebuller, #1496)
• Add option to use spline-interpolated energy loss (@lebuller, #1496)
• Add an Optical WLS (@whokion, #1507)
• Add muon pair production (@amandalund, #1518)
• Extend BIH capabilities for intersection operations (@elliottbiondo, #1479)
• Add along-step and tracking cut optical executors (@sethrj, #1540)
• Enable optical stepping loop (@sethrj, #1546)
• Simplify UnitProto after building a CsgUnit (@esseivaju, #1415)
• Implement device bitset (@esseivaju, #1547)
• Reduce celer-sim memory usage and improve its CELER_LOG transport output (@stognini, #1550)
• Support sense caching for future lazy evaluation (@esseivaju, #1539)
• Support building infix logic representation (@esseivaju, #1530)
• Import and use muon+hadron EM physics parameters (@amandalund, #1581)
• Extend Coulomb scattering to support additional particle types (@amandalund, #1574)
• Add optical model importer and refactor imported optical materials (@hhollenb, #1520)
• Add global Celeritas input definition (@sethrj, #1562)
• Always select at-rest process for stopped tracks (@amandalund, #1592)
• Use BIH to accelerate background_intersect (@elliottbiondo, #1599)
• Add ultra-simple tracking manager integration (@sethrj, #1609)
• Implement cubic spline interpolation (@amandalund, #1607)
• Add a calculator to integrate range from energy loss (@amandalund, #1544)
• Add G4Ellipsoid without bottom/top cuts (@elliottbiondo, #1617)
• Add safety visualization tool (@sethrj, #1614)
• Remove pointers from Geant4 labels (@sethrj, #1620)
• Add high-level user/fast sim integration helpers (@sethrj, #1615)
• Support spline interpolation on a nonuniform grid (@amandalund, #1625)
• Prune primaries that start outside the world volume (@sethrj, #1624)
• Add support for Z cuts when converting G4Solids (@elliottbiondo, #1638)
• Support sensitive detectors in replica/parameterized volumes (@sethrj, #1649)
• Add an option to enable status checker through celer-sim (@sethrj, #1650)
• Add support for elliptical cylinders and elliptical cones in orange and g4org (@elliottbiondo, #1642)
• Support post-step touchable location and step status (@sethrj, #1653)
• Support surface-based VecGeom 2.x navigator (@mrguilima, #1422)
• Approximate G4Torus using inner/outer bounding cylinders (@elliottbiondo, #1654)
• Support volume-specific uniform field (@amandalund, #1659)
• Implement discrete optical physics (@hhollenb, #1604)
• Add an example user action for gathering statistics on GPU (@sethrj, #1664)
• Add quantity support to FindInterp and template Turn (@sethrj, #1675)
• Support VecGeom 2.0 (@sethrj, #1674)
• Add 3D Cylindrical field map (@esseivaju, #1662)
• Make SB energy limit configurable and partially fix failures when using a single brems model (@amandalund, #1686)
• Add timers to accel integration classes (@amandalund, #1693)
• Use float for field interpolation (@esseivaju, #1684)
• Allow some "required" SetupOptions to be set via Geant4 UI (@sethrj, #1697)
• Support counter with NVTX (@esseivaju, #1702)
• Use programmatic optical counters instead of absurdly verbose printout (@sethrj, #1707)
• Allow G4 applications to query celeritas offload mode (@sethrj, #1711)
• Reduce logging verbosity during Geant4 runs (@sethrj, #1705)
• Improve messages when multiple tracks fail in flight (@sethrj, #1715)
• Estimate scintillation wavelength distribution parameters from tabulated values when only the latter is provided (@amandalund, #1722)
• Add utilities to stabilize downstream use of ORANGE (@sethrj, #1736)
• Expand support for spline interpolation (@amandalund, #1633)
• Add cartesian magnetic field using Covfie (@esseivaju, #1744)

Bug fixes

• Define a "unique event ID" different from event counter (@sethrj, #1447)
• Fix optical import when unused materials are defined (@sethrj, #1449)
• Remove trackid counter from primary (@sethrj, #1448)
• Improve single-event mode in accel (@sethrj, #1452)
• Fix GDML export messages and geometry-only use case (@sethrj, #1454)
• Fix tracking cut message (@sethrj, #1458)
• Anchor vtables to fix broken dynamic cast in tests (@sethrj, #1474)
• Fix documentation (@sethrj, #1502)
• Fix clang-tidy weekly cron (@esseivaju, #1541)
• Fix multiple release() calls to ensure nullptr is not used in process construction (@amandalund, #1612)
• Support different grid spacings for cross section data (@amandalund, #1622)
• Fix crash in multithreaded celer-g4 (@amandalund, #1627)
• Fix loading of GDML files with reflection (@sethrj, #1626)
• Fix navigation and mapping of reflecting volumes (@sethrj, #1629)
• Fix reading and writing HepMC3 events (@amandalund, #1635)
• Initialize MPI in high-level integration classes (@sethrj, #1672)
• Fix bremsstrahlung process construction when using only a single model (@amandalund, #1677)
• Lazily fetch volumes for UniformAlongStepFactory (@rahmans1, #1666)
• Fix BoundingZone floating point issue (@elliottbiondo, #1681)
• Fix out-of-bounds memory access in CylMapField (@amandalund, #1689)
• Fix Geant4 SD hit scoring (@amandalund, #1708)
• Fix field map usage from accel (@sethrj, #1724)
• Fix failures when integral approach is disabled (@amandalund, #1727)

Documentation improvements

• Improve XSCalculator documentation and tests (@sethrj, #1450)
• Require clang-tidy in CI (@esseivaju, #1524)
• Tidy headers (@esseivaju, #1534)
• Run clang-tidy on modified files only (@esseivaju, #1531)
• Build VecGeom in weekly clang-tidy cron (@esseivaju, #1551)
• Document and slightly refactor Bethe-Heitler interactor (@sethrj, #1553)
• Update copyrights (@sethrj, #1560)
• Enable more dependencies in clang-tidy checks (@esseivaju, #1561)
• Fix Doxygen member group formatting (@amandalund, #1567)
• Improve and fix documentation (@sethrj, #1588)
• Add generic geometry test interface to reduce duplication (@sethrj, #1623)
• Improve testing and documentation for VecGeom (@sethrj, #1639)
• Fix rendering of README (@dalg24, #1640)
• Add ORCID to citation (@esseivaju, #1645)
• Improve geometry testing (@sethrj, #1652)
• Move offload template into a celeritas::example namespace (@sethrj, #1663)
• Enable optical GPU tests (@amandalund, #1682)
• Update ROOT data and tests with Geant4 version 11.3.0 (@amandalund, #1687)
• Split EM physics and Geant4 interface into sub-files (@sethrj, #1698)
• Improve doc generation and brems-related documentation (@sethrj, #1701)
• Update Geant4 version to 11.3 in CI build (@amandalund, #1712)
• Add histogram helper class to simplify distribution tests (@amandalund, #1717)
• Add string simplifier helper class for testing (@sethrj, #1719)
• Improve MSC test code coverage (@sethrj, #1723)
• Add quick-start documentation for integrating (@sethrj, #1725)
• Fix pedantic warning in tests (@elliottbiondo, #1730)
• Add authorship guidelines (@sethrj, #1747)
• Support testing nested container equivalence and tweak Histogram class (@amandalund, #1753)

Minor internal changes

• Give priority to existing environment variables for G4 data location (@pcanal, #1457)
• Define id_cast helper function (@sethrj, #1459)
• Simplify geometry "volume" interface (@sethrj, #1460)
• Refactor step storage to use aux state (@sethrj, #1465)
• Refactor pinned allocator to reduce need for templates (@sethrj, #1468)
• Tweak Perfetto integration (@sethrj, #1470)
• Escape semicolons in exported CMake variables (@drbenmorgan, #1472)
• Require CELERITAS_DEBUG be on to enable CELERITAS_DEVICE_DEBUG (@amandalund, #1476)
• Use kernel launchers instead of macros (@sethrj, #1477)
• Fix missing brace and refactor #1475 (@sethrj, #1480)
• Fix build with latest Geant4 develop (@pcanal, #1484)
• Refactor "touchable updater" that uses a navigator (@sethrj, #1483)
• Store edge bounding boxes on BIH and refactor for upcoming intersection capabilities (@elliottbiondo, #1478)
• Add FourVector helper functions (@sethrj, #1510)
• Define hypotenuse function using fma (@sethrj, #1513)
• Add a helper class for inverse transform sampling (@amandalund, #1525)
• Rename Cerenkov to Cherenkov (@amandalund, #1533)
• Clean up optical mock test data (@hhollenb, #1519)
• Store a single process-integrated energy loss and range table per particle (@amandalund, #1536)
• Add piecewise integrator and CDF utilities (@sethrj, #1537)
• Define precision-agnostic Constant class (@sethrj, #1549)
• Adapt bitset word size (@esseivaju, #1554)
• Add 'LogicalTrue' functor (@sethrj, #1564)
• Fix unnecessary use of inline constexpr (@sethrj, #1568)
• Replace "volid" with "vol_id" throughout ORANGE (@elliottbiondo, #1486)
• Compose caching functionality of LazySenseCalculator (@esseivaju, #1569)
• Use lazy sense calculator (@esseivaju, #1576)
• Change PrimaryGeneratorAction to be a wrapper (@sethrj, #1593)
• Refactor primary generator using new inp (@sethrj, #1583)
• Add postfix to infix conversion utility (@esseivaju, #1582)
• Move physics lists out of details and rename tracking offload (@sethrj, #1603)
• Add TrackingManagerConstructor and SharedParams::GetMode (@sethrj, #1606)
• Move PolyEvaluator to corecel/math (@amandalund, #1610)
• Rename fast simulation offload (@sethrj, #1613)
• Rename Generic grid to Nonuniform (@amandalund, #1616)
• Require VecGeom 1.2.10 for CUDA RDC support (@pcanal, #1628)
• Construct CoreParams from new problem input in celer-sim (@sethrj, #1601)
• Move Geant4 SD integration into celeritas/ext (@sethrj, #1631)
• Refactor log handlers for better reuse (@sethrj, #1636)
• Rename CoreTrackView methods (@amandalund, #1658)
• Refactor geometry tests into common file (@sethrj, #1656)
• Use extern static data for versions, configuration (@sethrj, #1657)
• Use CLI11 for front end command line parsing (@sethrj, #1660)
• Hide Thrust from .cc code (@sethrj, #1670)
• Remove G4EmExtraPhysics from FtfpBertPhysicsList (@whokion, #1644)
• Define dependency helper targets and reorganize CMakeLists (@sethrj, #1673)
• Change default field substeps in accel (@esseivaju, #1690)
• Update and fix G4VG external integration (@sethrj, #1700)
• Use inp to build accel core params (@sethrj, #1632)
• Move random to corecel (@sethrj, #1716)
• Remove dependency of orange test on celeritas (@sethrj, #1718)
• Simplify Geant4 user application interface (@sethrj, #1729)
• Replace ImportPhysicsVector with inp::Grid (@amandalund, #1735)
• Add ExtThrust for more explicit dependencies (@sethrj, #1694)
• Rename field integration interfaces: Stepper→Integrators, Driver→Substepper (@sethrj, #1737)
• Add uniform grid input and continue to simplify grid construction (@amandalund, #1739)
• Rename material ID types (@sethrj, #1742)
• Simplify grid construction in a few more places (@amandalund, #1743)
• Fix ROCTX find: hip not cuda (@sethrj, #1755)
• Move types around to fix ROOT error (@sethrj, #1757)
• Simplify MSC angular sampling (@sethrj, #1714)

Deprecation and removal

• Delete obsolete demonstration apps (@sethrj, #1463)
• Remove 'default_stream' option (@sethrj, #1667)
• Remove deprecations for v0.6 (@sethrj, #1691)
• Remove macro setup from celer-g4 (@sethrj, #1710)
• Remove per-process switch for integral cross section method (@amandalund, #1734)
• Remove celer-dump-data app (@amandalund, #1740)

Reviewers

• Seth R. Johnson (@sethrj): 89
• Amanda Lund (@amandalund): 68
• Philippe Canal (@pcanal): 22
• Stefano Tognini (@stognini): 10
• Guilherme Lima (@mrguilima): 9
• Julien Esseiva (@esseivaju): 7
• Elliott Biondo (@elliottbiondo): 5
• Soon Yung Jun (@whokion): 3

Full Changelog: https://github.com/celeritas-project/celeritas/compare/v0.6.0-dev...v0.6.0

Version 0.6.1

Version 0.6.1 is a minor capability and bug fix update. Geant4-to-ORANGE conversion has gained new abilities including:

• Support for reflection
• Support for replicated and parameterized volumes
• New shapes including G4ExtrudedSolid, G4GenericPolycone, G4Paraboloid, polar-truncated sphere
• Fixes and improvements to deduplication of general quadric surfaces such as twisted trap faces and ellipsoids

Geant4 integration has improved with:

• Automatic generation of field maps from in-memory G4Field
• Track IDs are now reconstructed when returning hits to Geant4
• Track weights are propagated through Celeritas and returned to Geant4
• Additional data members are reconstructed in hit track/steps to reduce null pointers
• G4VTrackUserInfo and G4VProcess are reconstructed as valid (but not necessarily meaningful) pointers

Code compatibility improvements include:

• Support for CUDA 12.9 and NVCC with cxxstd=20
• Changes to allow GCC's overzealous -Wmissing-braces (#1863) used by CMSSW
• Fixes to include-what-you-use errors that failed newer compilers/c++ libs
• Support for CMake find_package(Celeritas) multiple times (still discouraged though)
• Allow multiple runs when using GPU
• Improved compatibility for Geant4 10
• Improved use of environment variables (now the value of CELER_DISABLE and others are considered, not just their existence)

Changes since v0.6.0 follow.

New features

• Add default values for track slots and initializer capacity (@amandalund, #1772)
• Complete optical stepping loop (@amandalund, #1792)
• Create IntersectRegion for a convex extruded polygon (@elliottbiondo, #1783)
• Adds Sensitive Detector parameter Class (@lebuller, #1764)
• Print Celeritas configuration options when loading downstream (@sethrj, #1802)
• Make optical max_step_iters configurable and properly reset state after aborting (@amandalund, #1805)
• Add reflection to ORANGE (@sethrj, #1807)
• Add options to forcibly disable Cherenkov and scintillation (@amandalund, #1814)
• Add replica+parameterisation support to ORANGE (@sethrj, #1817)
• Add surface normal calculations in GeoTrackView (@hhollenb, #1804)
• Add WLS model class, generator, and executor and support second WLS process (@amandalund, #1816)
• Support configurable WLS reemission time distribution (@amandalund, #1822)
• Add volume params to represent Geant4 volume graph (@sethrj, #1821)
• Full G4ExtrudedSolid support (@elliottbiondo, #1808)
• Read and export Geant4 surface definitions (@sethrj, #1824)
• Add in-situ cartesian field map construction from Geant4 (@esseivaju, #1828)
• Add geometry surface definitions to runtime (@sethrj, #1812)
• Output optical actions (@amandalund, #1836)
• Add polar truncation for sphere shape (@sethrj, #1832)
• Generate optical photons directly into track slots for 2× GPU speedup (@amandalund, #1844)
• Add track weight propagation to secondaries track (@Rashika-Gupta, #1847)
• Reconstruct Geant4 TrackID (@esseivaju, #1837)
• Update HitProcessor test to support non unit weights (@Rashika-Gupta, #1853)
• Add optical primary generator (@amandalund, #1858)
• Add VolumeSurfaceSelector (@hhollenb, #1859)
• Add pre-commit spell checking (@sethrj, #1867)
• Reconstruct G4VTrackUserInfo and G4VProcess (@esseivaju, #1866)
• Allow multiple "activate device" calls if not modifying device (@sethrj, #1938)
• Add TrackProcessor class for reconstructing Geant4 tracks (@esseivaju, #1869)
• Add RevolvedSpecialTrapezoid as a first step towards G4GenericPolycone (@elliottbiondo, #1840)
• Add full support for G4GenericPolycone (@elliottbiondo, #1892)
• Add support for G4Paraboloid (@elliottbiondo, #1893)
• Support discontinuities in nonuniform grid calculator (@sethrj, #1906)
• Use environment variable values if set (@sethrj, #1937)

Bug fixes

• Patch covfie shasum (@esseivaju, #1771)
• Fix table size in physics construction (@amandalund, #1780)
• Fix and refactor maximum cross section energy calculation for integral approach (@amandalund, #1776)
• Support CUDA 12.9 and NVCC with cxxstd=20 (@sethrj, #1787)
• Fix sincospi on device (@amandalund, #1791)
• Fix assigning parent ID to track initializer (@amandalund, #1795)
• Fix orange polyhedron orientation and roundoff error (@sethrj, #1806)
• Flush optical tracks at the end of core stepping loop (@amandalund, #1834)
• Reconstruct additional data in G4Track (@sethrj, #1835)
• Add null pointer checks for Geant4 surfaces (@sethrj, #1841)
• Fix counters in optical generator action (@amandalund, #1857)
• Protect Celeritas::G4 CMake target against double creation (@drbenmorgan, #1879)
• Fix oversimplification of simple quadrics (@sethrj, #1897)
• Fix normalization and edge cases on twisted GenPrism faces (@sethrj, #1899)
• Fix weight reconstruction for GeantSd (@sethrj, #1940)

Documentation improvements

• Release v0.6.0 (@sethrj, #1688)
• Add helper for accumulating histograms (@sethrj, #1759)
• Add zenodo citations to celeritas user manual (@sethrj, #1762)
• Require covfie v0.14 (@esseivaju, #1767)
• Replace hand-rolled hooks with pre-commit and CI (@sethrj, #1765)
• Refactor micro xs CDF calculation and add test (@amandalund, #1768)
• Edit user manual and fix PDF build (@sethrj, #1782)
• Document geometry hierarchy and move EM table (@sethrj, #1788)
• Round all floating point numbers in test output to a few digits (@sethrj, #1758)
• Work around a doxy/breathe rendering bug and make some notes internal (@sethrj, #1797)
• Replace EXPECT_VEC_CLOSE with soft comparator (@sethrj, #1819)
• Finish updating copyrights (@amandalund, #1820)
• Update build script and user presets (@sethrj, #1845)
• Detect and use ccache (@esseivaju, #1848)
• Revert one unintentional typo change from #1867 (@pcanal, #1871)

Minor internal changes

• Fail early if find-or-builtin package is missing (@sethrj, #1770)
• Remove ValueGridBuilders (@amandalund, #1766)
• Add ostream support for enums (@amandalund, #1774)
• Add missing typename and const to CartMapField (@esseivaju, #1769)
• Apply pre-commit hooks across repository (@sethrj, #1773)
• Rename logspace to geomspace (@sethrj, #1777)
• Use correct types for physics grids (@amandalund, #1781)
• Add tests and documentation for Tsai nuclear screening functions (@sethrj, #1779)
• Adjust version compatibility for covfie (@sethrj, #1778)
• Simplify nested join nodes (@sethrj, #1784)
• Store hardwired model data by reference (@amandalund, #1785)
• Organize optical directory (@amandalund, #1789)
• Move core track initialization to CoreTrackView (@amandalund, #1794)
• Add make_orthogonal helper function (@sethrj, #1793)
• Move magnetic field retrieval to a helper function (@sethrj, #1798)
• Extend auxiliary data helpers to support aux state data without params (@amandalund, #1799)
• Keep persistent GeantGeoParams for geometry translation (@sethrj, #1796)
• Refactor optical generation to reduce duplication (@amandalund, #1800)
• Move optical photon generation to optical stepping loop (@amandalund, #1803)
• Make Geant4 volume IDs consistent wrt load order (@sethrj, #1809)
• Fix configuring against latest VecGeom with CUDA disabled (@pcanal, #1813)
• Rename SurfaceId in preparation for volume-based surface definitions (@sethrj, #1811)
• Rearrange generic geo test interface (@sethrj, #1818)
• Use variant set for uniform field input (@amandalund, #1826)
• Rename solid angle class (@sethrj, #1825)
• Optimize cosine for turn (@sethrj, #1830)
• Refactor solid Z slab as Truncated object (@sethrj, #1827)
• Use start/stop instead of start/interior for azimuthal wedge (@sethrj, #1831)
• Add surface properties to core and optical params (@amandalund, #1838)
• Add a helper function for launching a CPU kernel with an arbitrary number of threads (@amandalund, #1842)
• Define geometry implementation IDs (@sethrj, #1839)
• Add generator interface and registry (@amandalund, #1849)
• Document and improve build script (@sethrj, #1854)
• Hotfix: revert accidental changes from #1839 (@sethrj, #1856)
• Add volume params to core (@sethrj, #1846)
• Add surface physics map (@sethrj, #1852)
• Begin exposing Cherenkov/optical loop outside of the optical collector (@sethrj, #1861)
• IWYU on some files (@sethrj, #1935)
• Convert to using counterclockwise order for polygons (@elliottbiondo, #1873)
• Delete IPAContextException (@sethrj, #1882)
• Use class constructors rather than initialization for Array to fix CMS (@sethrj, #1887)
• Add RevolvedPolygon class (@elliottbiondo, #1888)
• Define throw helper functions to reduce code bloat and improve performance (@sethrj, #1908)
• Update particle speed calculation to be more robust against round-off error (@amandalund, #1917)
• Add custom error handler to unify G4 exception handlers (@sethrj, #1919)

Deprecation and removal

• Remove combined bremsstrahlung model (@amandalund, #1786)
• Remove SpecialTrapezoid and RevolvedSpecialTrapezoid classes (@elliottbiondo, #1890)

Reviewers

• Seth R. Johnson (@sethrj): 50
• Amanda Lund (@amandalund): 30
• Philippe Canal (@pcanal): 13
• Julien Esseiva (@esseivaju): 9
• Elliott Biondo (@elliottbiondo): 9
• Guilherme Lima (@mrguilima): 4
• Soon Yung Jun (@whokion): 2
• Rashika Gupta (@Rashika-Gupta): 2
• Stefano Tognini (@stognini): 1
• Sakib Rahman (@rahmans1): 1
• Lance Bullerwell (@lebuller): 1
• Hayden Hollenbeck (@hhollenb): 1

Full Changelog: https://github.com/celeritas-project/celeritas/compare/v0.6.0...v0.6.1

Version 0.6.2

Version 0.6.2 is a minor bug fix update.

• Fixed reconstruction of track weights in returned Geant4 hits
• Improved documentation and use of CELER_USE_PROFILING
• Added push/flush profiling counters in accel interface - Update externals to latest versions (including G4VG 1.0.5 with VecGeom/CUDA fix)

Changes since v0.6.1 follow.

New features

• Warn user when running large problems on debug build (@sethrj, #1971)
• Improve version metadata for built-in packages and VecGeom (@sethrj, #1929)

Bug fixes

• Fix propagation of weight from primary to track to secondary (@sethrj, #1965)

Documentation improvements

• Add documentation and use flag for CELER_USE_PROFILING (@sethrj, #1966)
• Fix cache clearing (@sethrj, #1979)

Minor internal changes

• Add push/flush profiling to accel interface (@sethrj, #1968)
• Update externals (@sethrj, #1977)
• Add iostream wrappers for Geant physics options (@sethrj, #1981)

Reviewers

• Philippe Canal (@pcanal): 4
• Amanda Lund (@amandalund): 3
• Rashika Gupta (@Rashika-Gupta): 1

Full Changelog: https://github.com/celeritas-project/celeritas/compare/v0.6.1...v0.6.2