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pyvista/pyvista: VTK 9 Support and PyQt5 Refactor

Bane Sullivan; Alex Kaszynski; Guillaume Favelier; Jevin Jones; Henrik Åhl; Simon Frei; Andras Deak; Tetsuo Koyama; Eric Larson; Keurfon Luu; Dieter Werthmüller; Leonardo Uieda; dcbr; math-artist; Ashley Scillitoe; Denis Sergeev; Florian LB; Florian Wagner; Guillaume Jacquenot; JasonTLin; Jiawei Zhuang; Marco Musy; MatthewFlamm; Max Li; Mikolaj Magnuski; Nicolas Cedilnik; Ruben de Bruin; michi1510; ralovich; tomsal

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<oai_dc:dc xmlns:dc="" xmlns:oai_dc="" xmlns:xsi="" xsi:schemaLocation="">
  <dc:creator>Bane Sullivan</dc:creator>
  <dc:creator>Alex Kaszynski</dc:creator>
  <dc:creator>Guillaume Favelier</dc:creator>
  <dc:creator>Jevin Jones</dc:creator>
  <dc:creator>Henrik Åhl</dc:creator>
  <dc:creator>Simon Frei</dc:creator>
  <dc:creator>Andras Deak</dc:creator>
  <dc:creator>Tetsuo Koyama</dc:creator>
  <dc:creator>Eric Larson</dc:creator>
  <dc:creator>Keurfon Luu</dc:creator>
  <dc:creator>Dieter Werthmüller</dc:creator>
  <dc:creator>Leonardo Uieda</dc:creator>
  <dc:creator>Ashley Scillitoe</dc:creator>
  <dc:creator>Denis Sergeev</dc:creator>
  <dc:creator>Florian LB</dc:creator>
  <dc:creator>Florian Wagner</dc:creator>
  <dc:creator>Guillaume Jacquenot</dc:creator>
  <dc:creator>Jiawei Zhuang</dc:creator>
  <dc:creator>Marco Musy</dc:creator>
  <dc:creator>Max Li</dc:creator>
  <dc:creator>Mikolaj Magnuski</dc:creator>
  <dc:creator>Nicolas Cedilnik</dc:creator>
  <dc:creator>Ruben de Bruin</dc:creator>
  <dc:description>Release 0.25.1
It's been three months since the last release and there are quite a few bug fixes and features that are ready to be tested.  Please see the release candidate wheels here:
@pyvista/developers, the next release is ready to be tested out.  Please install the wheel and post any issues you encounter here.
Ideally, we can test the RC and if there are no problems we can have the release out by the end of this week.  There are a few projects that need Python 3.8 support, and which means supporting VTKv9.

Here are the release notes.  I've drafted it here so we can just copy and paste it into the release.
Major API Changes

Moved BackgroundPlotter and QtInteractor to pyvistaqt.  See #719 for the reasoning, but as a summary this boils down to licencing, unit testing, and improved development.  See pyvistaqt to test out the new module.  Wheels will be released for that as soon as we've released wheels for pyvista==0.25.0 as it's a dependancy.
Added better support for VTKv9.  There were several changes under the hood to VTK's UnstructuredGrids that need to be implemented here, as well as many changes to our unit testing and CI to support Python 3.8 and VTKv9.  See #732, #772, and #693.


Removing cells or faces (#653)
Progress bar using tqdm (#608)
Plotting floors (#424)
Additional geometry features (#449)
Subplot groups (#696)
Custom orientation widget (#702)

Bug Fixes

Checking vectors when setting vectors #763 
Check overwriting dataset to avoid segfault #738 
Fix faulthandler (#694 and #645)
Implicit point setters (#769)
Ellipsoid wrapping (#705)

CI Improvements

Unit testing is between 25-40% faster.  MacOS testing no supports multiple testing processes using pytest-xdist.  See #739 and #744 
Improved code coverage #745 and #709
Removed all example downloading from unit testing.  Greatly improves test stability (#731)
Various speedups (#661)


Removed untested pyansys quality method.
Using underscore numpy types (#762)
Optimized imports (#743)
Line break consistent (#737)
Use new style super() calls (#741)
Generic load/save (#736)
Refactored active scalars/vectors (#746)
Better error types (#759)
And many many more...

Thanks to all those who contributed to this release!  In no particular order:

  <dc:title>pyvista/pyvista: VTK 9 Support and PyQt5 Refactor</dc:title>
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