Refactoring and cleaning

[obackhouse]

Lots of code cleanup and some minor refactoring to simplify things, improved docstrings, also flake8 linting.

[codecov-commenter]

Codecov Report

Patch coverage: 93.69% and project coverage change: -0.03 ⚠️

Comparison is base (47e2058) 99.58% compared to head (ef81d05) 99.56%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #28      +/-   ##
==========================================
- Coverage   99.58%   99.56%   -0.03%     
==========================================
  Files          54       54              
  Lines       85707    85708       +1     
  Branches      724      817      +93     
==========================================
- Hits        85355    85333      -22     
- Misses        237      249      +12     
- Partials      115      126      +11     

Impacted Files	Coverage Δ
ebcc/__init__.py	98.73% <ø> (ø)
ebcc/ansatz.py	80.58% <ø> (-0.19%)	⬇️
ebcc/space.py	91.26% <ø> (ø)
ebcc/util.py	70.44% <75.47%> (-1.04%)	⬇️
ebcc/rebcc.py	86.09% <89.58%> (-1.31%)	⬇️
ebcc/reom.py	94.30% <97.22%> (+0.08%)	⬆️
ebcc/uebcc.py	96.79% <97.24%> (-0.67%)	⬇️
ebcc/brueckner.py	90.69% <100.00%> (+0.10%)	⬆️
ebcc/dump.py	86.17% <100.00%> (-0.96%)	⬇️
ebcc/eris.py	86.07% <100.00%> (+0.36%)	⬆️
... and 4 more

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