Switch default NL writer to nlv2

[jsiirola]

Fixes # .

Summary/Motivation:

This switches the default NL writer to the new "NLv2" writer.

Changes proposed in this PR:

• Change default NL writer
• Update pyomo.mpec.complementarity to suppress deprecation warnings
• Testing
  • Add explicit NL v1 and v2 tests for complementarity and suffixes
  • Skip a test on old versions of CPLEX where changing variable ordering could cause CPLEX to calculate incorrect duals
• Fix handling of the default file_determinism flag int eh NLv1 writer
• NLv2 writer updates
  • NL writer will by default write files using Unix-style (not universal) newlines. This is due to a bug in how the ASL handles string arguments (it cannot correctly parse string arguments terminated with windows-style newlines)
  • map inf/-inf bounds on Constraints/Vars to None
  • Add warnings for writing NL files containing string arguments using \r\n line terminators
  • Add processing of complementarity constraints (not the preferred solution, but this replicated the functionality in the NLv1 writer)

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.

[michaelbynum]

We should add an issue to eventually remove the old nl writer.

[codecov]

Codecov Report

Base: 87.04% // Head: 87.09% // Increases project coverage by +0.05% 🎉

Coverage data is based on head (50d518a) compared to base (517060e).
Patch coverage: 96.07% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2676      +/-   ##
==========================================
+ Coverage   87.04%   87.09%   +0.05%     
==========================================
  Files         757      757              
  Lines       84596    84898     +302     
==========================================
+ Hits        73638    73945     +307     
+ Misses      10958    10953       -5     

Flag	Coverage Δ
linux	84.55% <94.11%> (+0.10%)	⬆️
osx	74.58% <88.23%> (+0.07%)	⬆️
other	84.73% <96.07%> (+0.09%)	⬆️
win	81.89% <90.19%> (+0.09%)	⬆️

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/scripting/solve_config.py	98.66% <ø> (ø)
pyomo/repn/plugins/nl_writer.py	93.25% <95.74%> (+7.36%)	⬆️
pyomo/mpec/complementarity.py	95.90% <100.00%> (ø)
pyomo/scripting/util.py	59.01% <100.00%> (ø)
pyomo/contrib/pyros/master_problem_methods.py	79.28% <0.00%> (-8.80%)	⬇️
pyomo/util/components.py	96.42% <0.00%> (-3.58%)	⬇️
pyomo/repn/plugins/ampl/ampl_.py	83.26% <0.00%> (-2.94%)	⬇️
pyomo/common/deprecation.py	96.58% <0.00%> (-1.47%)	⬇️
pyomo/util/calc_var_value.py	100.00% <0.00%> (ø)
... and 9 more

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[michaelbynum]

One minor comment below.

[mrmundt]

Looks really good, @jsiirola . I didn't even see any typos.