Various improvements, mainly related to cleaning up example scripts

[bwohlberg]

Various improvements, mainly related to cleaning up example scripts.

[codecov]

Codecov Report

Merging #379 (e78340a) into main (dba1e4e) will increase coverage by 0.03%.
The diff coverage is 100.00%.

❗ Current head e78340a differs from pull request most recent head fd46f3d. Consider uploading reports for the commit fd46f3d to get more accurate results

@@            Coverage Diff             @@
##             main     #379      +/-   ##
==========================================
+ Coverage   94.21%   94.24%   +0.03%     
==========================================
  Files          84       84              
  Lines        5048     5057       +9     
==========================================
+ Hits         4756     4766      +10     
+ Misses        292      291       -1     

Flag	Coverage Δ
unittests	94.24% <100.00%> (+0.03%)	⬆️

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

Impacted Files	Coverage Δ
scico/linop/_circconv.py	85.57% <ø> (+0.96%)	⬆️
scico/linop/_diff.py	98.30% <ø> (ø)
scico/linop/_func.py	100.00% <ø> (ø)
scico/linop/_stack.py	87.64% <ø> (ø)
scico/numpy/_blockarray.py	97.43% <ø> (ø)
scico/operator/_func.py	100.00% <ø> (ø)
scico/denoiser.py	88.78% <100.00%> (+0.32%)	⬆️
scico/diagnostics.py	92.53% <100.00%> (ø)
scico/functional/_denoiser.py	100.00% <100.00%> (ø)

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