Miscellaneous changes

[bwohlberg]

• Modify setup.py to improve consistency in dependency specification
• Add note to docs on pinning black version in conda
• Implement more compact iteration stats initialization in optimizer classes (except PGM)
• Additional iteration stats columns for iterative ADMM subproblem solvers
• More robust implementation of IterationStats.__init__
• Abbreviate ADMM primal residual column name in iteration stats
• Suppress annoying pytest DeprecationWarning regarding imp in compat

[codecov]

Codecov Report

Merging #143 (38a1781) into main (f899f3a) will increase coverage by 0.14%.
The diff coverage is 96.22%.

@@            Coverage Diff             @@
##             main     #143      +/-   ##
==========================================
+ Coverage   91.92%   92.07%   +0.14%     
==========================================
  Files          47       47              
  Lines        3209     3231      +22     
==========================================
+ Hits         2950     2975      +25     
+ Misses        259      256       -3     

Flag	Coverage Δ
unittests	92.07% <96.22%> (+0.14%)	⬆️

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

Impacted Files	Coverage Δ
scico/__init__.py	87.50% <ø> (ø)
scico/optimize/pgm.py	94.81% <0.00%> (ø)
scico/diagnostics.py	88.23% <92.85%> (+0.35%)	⬆️
scico/optimize/_ladmm.py	98.86% <100.00%> (+1.21%)	⬆️
scico/optimize/_primaldual.py	100.00% <100.00%> (+1.31%)	⬆️
scico/optimize/admm.py	96.09% <100.00%> (+0.80%)	⬆️

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