Miscellaneous changes (to be closed)

[bwohlberg]

See #143: rebase of this branch to remove already-merged commit. This PR will be closed once #143 is merged.

• 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 DeprecationWarning regarding imp in compat

[codecov]

Codecov Report

Merging #142 (b0362ca) into main (3dfa33d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #142   +/-   ##
=======================================
  Coverage   92.07%   92.07%           
=======================================
  Files          47       47           
  Lines        3231     3231           
=======================================
  Hits         2975     2975           
  Misses        256      256           

Flag	Coverage Δ
unittests	92.07% <0.00%> (ø)

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[bwohlberg]

All changes already introduced in #143.