Add doctest of modules to workflow, fix modules so they pass

[Michael-T-McCann]

Also gets the "unit tests / pytest" action to correctly install astra-toolbox and therefore not skip test_radon_astra.py.

Addresses https://github.com/scici/scico/issues/233

[codecov]

Codecov Report

Merging #247 (31152ce) into main (d9b1190) will increase coverage by 1.08%.
The diff coverage is n/a.

❗ Current head 31152ce differs from pull request most recent head 6b709f5. Consider uploading reports for the commit 6b709f5 to get more accurate results

@@            Coverage Diff             @@
##             main     #247      +/-   ##
==========================================
+ Coverage   92.63%   93.71%   +1.08%     
==========================================
  Files          49       49              
  Lines        3517     3517              
==========================================
+ Hits         3258     3296      +38     
+ Misses        259      221      -38     

Flag	Coverage Δ
unittests	93.71% <ø> (+1.08%)	⬆️

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Impacted Files	Coverage Δ
scico/linop/_diff.py	92.68% <ø> (ø)
scico/util.py	90.98% <ø> (ø)
scico/linop/radon_astra.py	66.19% <0.00%> (+53.52%)	⬆️

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[Michael-T-McCann]

@bwohlberg Any ideas on why the readthedocs build is failing? I notice it is (1) throwing No module named 'ipython_genutils' and (2) running python3.7. But I can't see the action to debug further and have no idea how my changes would impact it.

[bwohlberg]

@bwohlberg Any ideas on why the readthedocs build is failing? I notice it is (1) throwing No module named 'ipython_genutils' and (2) running python3.7. But I can't see the action to debug further and have no idea how my changes would impact it.

It doesn't seem to be related to anything in this PR. Presumably a recent change in one of the docs dependencies, possibly nbsphinx, has broken the build. I'll look into it.

[bwohlberg]

It doesn't seem to be related to anything in this PR. Presumably a recent change in one of the docs dependencies, possibly nbsphinx, has broken the build. I'll look into it.

Fixed in #248.