Attempt to fix Windows build failures on CI

[keflavich]

The problems are all invocation errors: https://github.com/radio-astro-tools/spectral-cube/runs/4475860538?check_suite_focus=true#step:5:255

but it seems to be pointing at a file not closed error: https://github.com/radio-astro-tools/spectral-cube/runs/4475860538?check_suite_focus=true#step:5:153

..\..\spectral_cube\spectral_axis.py .                                   [  0%]
..\..\spectral_cube\tests\test_analysis_functions.py ................... [  1%]
                                                                         [  1%]
..\..\spectral_cube\tests\test_casafuncs.py ......ssssssssssssss         [  2%]
..\..\spectral_cube\tests\test_cube_utils.py .......                     [  2%]
..\..\spectral_cube\tests\test_dask.py ....s...E                         [  3%]
..\..\spectral_cube\tests\test_io.py .E.E.E.E.E.E.E.E.E.E.E.E.E.E.E.E.E.E [  4%]

so... let's see if we can fix it.

[keflavich]

There was a bug introduced in pvextractor that caused gui stuff to fail

[keflavich]

Unfortunately I've uncovered a real error (a regression) caused by some change in region handling. Something about compound region bboxes has changed, breaking our tests

[keflavich]

Some things were really broken, including one of our tests.

Both of these tests were incorrectly only getting 1 pixel along the spectral direction, but investigating in ds9 showed that 2 should've been included:

                             (('fk5.reg', (slice(None), 1, slice(None))),
                              ('fk5_twoboxes.reg', (slice(None), 1, slice(None))),

[codecov-commenter]

Codecov Report

Merging #779 (fe3c951) into master (1f67a8f) will decrease coverage by 0.04%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #779      +/-   ##
==========================================
- Coverage   77.86%   77.82%   -0.05%     
==========================================
  Files          24       24              
  Lines        5811     5814       +3     
==========================================
  Hits         4525     4525              
- Misses       1286     1289       +3     

Impacted Files	Coverage Δ
spectral_cube/spectral_cube.py	76.65% <0.00%> (-0.16%)	:arrow_down:

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[keflavich]

@astrofrog @e-koch I'm requesting reviews from both of you because I made some significant logical changes in the region handling. I think we had an uncaught error (actually an error in our tests) previously. It would be good to have an independent look at that if possible

[keflavich]

@e-koch you want to make those suggested changes directly on this PR?

[e-koch]

@keflavich Done!