Viscid

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Changes:
- implement `visicd --version` and `python -m viscid --version`

Bugfixes:
- pypi metadata fixes

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Changes:
- merge new fluid tracer

Backward Incompatible Changes:
- new tightlim option for 2d plots enabled by default; this may change plot appearance unexpectedly

Bugfixes:
- python-only install always works, even on windows
- only use equal axis by default if aspect ratio <= 4; this may change plot appearance unexpectedly
- fix amr xl / xh

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Bugfixes:
- Bugfixes and matplotlib workarounds

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Bugfixes:
- uneven amr slices (see 16)
- length-0 slices (see 16)
- slowness of vpic reader (see 20)

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Changes:
- add max_t to streamlines
- streamlines are now truncated at max_length and max_t. This means ds can be non-uniform even for non-adaptive methods.
- Preliminary VPIC reader
- add seed.Spline
- seed.Points can now specipy custom local representation
- vpyplot: plt.axis('equal') default changed to plt.axis('image')
- vpyplot: by default, colorbars are now added using the axis1 toolkit
- Various Gkeyll reader enhancements

Bugfixes:
- Most libgfortran compile / runtime errors should now be gone
- Vector calculus on faux 2d fields works in more cases
- faux 2d AMR fields can now be sliced in invarient dimension
- lots of little fixes when slicing with newaxis / ellipsis
- lots of little fixes when slicing with datetimes

Refactors:
- viscid.multiplot.multiplot -> viscid.multiplot.make_multiplot
- viscid.calculator.cluster.cluster -> viscid.calculator.cluster.find_clusters

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Changes:
- Misc. matplotlib 2d line plot bug fixes
- Reorganize html docs (more logical layout is better)
- Update revoked github token