waqasbhatti/astrobase: astrobase v0.3.4

• checkplot: added cross-matching against external catalogs
• checkplotserver: add GAIA information
• checkplotserver: add display of GAIA CMD for object if available
• checkplotserver: add xmatch information
• checkplotserver: added all current astrobase period-finders and their specific options
• checkplotserver: added time, mag/flux filtering, and sigclip for period-search tab
• checkplotserver: link to neighbors' checkplots if they're in current collection
• checkplotserver: add some more var/obj tags available by default
• coordutils: add general kdtree functions
• cpserver.js: add xypos to GAIA neighbor display, for TBD cutout overlay
• lcproc: add xmatch drivers
• lcproc: get color/mag diffs between object and LCC neighbors
• lcproc: implemented functions to add CMDs to checkplots
• magnitudes: add GAIA absolute mag calc
• services.gaia: also get parallaxes from the gaia_source table if available
• starfeatures: attempt to handle no close GAIA matches
• starfeatures: get BV from JHK if necessary
• starfeatures: get GAIA xy positions on object Skyview cutout

Lots of reorganization and cleanup:

• hatlc, hplc, oldhatlc, k2hat were all moved to the hatsurveys subpackage
• all checkplotserver related modules are now in the cpserver subpackage

Other changes:

• checkplot, lcproc: change default nbr radius to 60 arcsec
• checkplot: starfeatures.neighbor_features -> neighbor_gaia_features
• checkplotserver: default nav shortcut key now alt+shift+left/right instead of ctrl+left/right
• checkplotserver UI: reorganized for better workflow, disabled TBD elements for now
• lcproc, checkplot: put in xmatch kwargs and calls
• setup.py: add cpserver subpackage

• checkplot: fix location for font
• checkplot, cpserver: various fixes to imports and nan-handling
• cpserver, cp: fix JSON encoder to handle more weird things
• cpserver: make ACF period search actually work from the frontend
• cpserver: handle case where neighbors don't have LCs
• cpserver: handle nans better in arrays sent to frontend
• cpserver: handle nans from xmatch results
• cps UI: clear periodsearch elems on checkplot load
• cps UI: load previously saved period/epoch for plotting in psearch-tab
• cps UI: more small fixes
• lcmath: add missing imports
• lcproc: fixed bugs with new neighbor processing
• lcproc: fix issue with missing LC renorm for runcp
• periodbase.macf: fix filterwindow kwarg