Minor clean up and packaging fix

[bwohlberg]

Minor clean up and packaging fix.

[codecov]

Codecov Report

Merging #254 (11857de) into main (e6e5776) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #254      +/-   ##
==========================================
- Coverage   93.71%   93.69%   -0.02%     
==========================================
  Files          49       49              
  Lines        3517     3507      -10     
==========================================
- Hits         3296     3286      -10     
  Misses        221      221              

Flag	Coverage Δ
unittests	93.69% <ø> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
scico/blockarray.py	91.18% <ø> (-0.03%)	⬇️
scico/diagnostics.py	88.05% <ø> (-0.18%)	⬇️
scico/functional/_functional.py	88.33% <ø> (ø)
scico/linop/_convolve.py	86.31% <ø> (-0.15%)	⬇️
scico/linop/_dft.py	100.00% <ø> (ø)
scico/linop/_linop.py	97.95% <ø> (-0.03%)	⬇️
scico/linop/_matrix.py	95.86% <ø> (-0.04%)	⬇️
scico/linop/optics.py	95.68% <ø> (-0.04%)	⬇️
scico/loss.py	93.06% <ø> (ø)
scico/metric.py	100.00% <ø> (ø)
... and 2 more

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[FernandoDavis]

LGTM