Apply black to pyomo/repn directory py files

[mrmundt]

Fixes (Partly) #329

Summary/Motivation:

This is the first in a relatively long string of PRs to apply PEP8 standards via black to Pyomo. We are following the standard used by IDAES except that we are adding the -S option: Don't normalize string quotes or prefixes and the -C option: Don't use trailing commas as a reason to split lines.

NOTE: All changes are NFC.

Full command used: cd pyomo/repn && black -S -C .

Changes proposed in this PR:

• Apply black to the pyomo/repn directory py files
• Manually fixed odd spacing introduced by merging lines (@blnicho )

Legal Acknowledgement

By contributing to this software project, I have read the contribution guide and agree to the following terms and conditions for my contribution:

1. I agree my contributions are submitted under the BSD license.
2. I represent I am authorized to make the contributions and grant the license. If my employer has rights to intellectual property that includes these contributions, I represent that I have received permission to make contributions and grant the required license on behalf of that employer.

[codecov]

Codecov Report

Base: 82.23% // Head: 86.98% // Increases project coverage by +4.75% 🎉

Coverage data is based on head (7c30d21) compared to base (3d8a9a0).
Patch coverage: 82.45% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2737      +/-   ##
==========================================
+ Coverage   82.23%   86.98%   +4.75%     
==========================================
  Files         771      771              
  Lines       86306    86309       +3     
==========================================
+ Hits        70975    75078    +4103     
+ Misses      15331    11231    -4100     

Flag	Coverage Δ
linux	84.15% <82.45%> (?)
osx	73.63% <82.02%> (?)
other	84.34% <82.16%> (?)
win	81.52% <81.88%> (?)

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

Impacted Files	Coverage Δ
pyomo/repn/plugins/__init__.py	100.00% <ø> (ø)
pyomo/repn/standard_aux.py	50.00% <ø> (ø)
pyomo/repn/beta/matrix.py	74.31% <54.54%> (ø)
pyomo/repn/plugins/gams_writer.py	85.42% <66.66%> (ø)
pyomo/repn/plugins/baron_writer.py	81.84% <70.90%> (ø)
pyomo/repn/plugins/ampl/ampl_.py	81.40% <79.35%> (-1.47%)	⬇️
pyomo/repn/standard_repn.py	88.28% <88.15%> (ø)
pyomo/repn/plugins/cpxlp.py	93.48% <93.54%> (ø)
pyomo/repn/plugins/mps.py	93.03% <94.64%> (ø)
pyomo/repn/plugins/nl_writer.py	93.62% <96.15%> (-0.15%)	⬇️
... and 114 more

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