Apply black to pyomo/core 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/core && black -S -C .

⚠️ Please squash this at merge. ⚠️

Changes proposed in this PR:

• Apply black to the pyomo/core directory py files
• Manually fix instances where two lines were merged and left " " or ' '

Legal Acknowledgement

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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

Patch coverage: 87.49% and no project coverage change.

Comparison is base (ed13c8c) 87.01% compared to head (9c8a6cf) 87.01%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2777   +/-   ##
=======================================
  Coverage   87.01%   87.01%           
=======================================
  Files         763      763           
  Lines       87173    87213   +40     
=======================================
+ Hits        75857    75892   +35     
- Misses      11316    11321    +5     

Flag	Coverage Δ
linux	84.02% <87.42%> (-0.01%)	⬇️
osx	73.52% <87.28%> (-0.01%)	⬇️
other	84.20% <87.42%> (-0.02%)	⬇️
win	81.53% <87.35%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
pyomo/core/base/blockutil.py	0.00% <0.00%> (ø)
pyomo/core/base/instance2dat.py	9.09% <0.00%> (ø)
pyomo/core/base/numvalue.py	100.00% <ø> (ø)
pyomo/core/base/plugin.py	0.00% <0.00%> (ø)
pyomo/core/base/rangeset.py	100.00% <ø> (ø)
pyomo/core/base/set_types.py	100.00% <ø> (ø)
pyomo/core/base/sets.py	0.00% <ø> (ø)
pyomo/core/base/symbolic.py	0.00% <0.00%> (ø)
pyomo/core/base/template_expr.py	0.00% <ø> (ø)
pyomo/core/beta/__init__.py	100.00% <ø> (ø)
... and 103 more

... and 3 files with indirect coverage changes

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[mrmundt]

⚠️ Please squash this at merge. ⚠️

[jsiirola]

I found (and fixed) some places where black didn't quite make the strings / comments as clean as it could have. Everything else looked fine.