Fix bugs in SmoothVLE2 initialization

[dallan-keylogic]

Fixes

• Able to initialize using SmoothVLE2 when non-condensables are present.
• Correctly takes into account presence of non-volatiles in dew point calculations

Summary/Motivation:

Addresses #1560 .

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[bpaul4]

It appears that the framework does not create these equilibrium properties because there is only one VLE component in the system, which makes sense. Are there tests for other scenarios, for example one or more non-condensable or non-volatile components in a system with two or more VLE components? In those cases, these properties should still be created.

[dallan-keylogic]

The SmoothVLE2 method doesn't need bubble and dew points to operate, unlike the original SmoothVLE. The test coverage here is pretty poor, but I wanted to fix the outstanding issue quickly before moving onto other things.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.06%. Comparing base (d43c5dd) to head (9b9bdfa).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1563   +/-   ##
=======================================
  Coverage   77.06%   77.06%           
=======================================
  Files         389      389           
  Lines       62680    62680           
  Branches    10276    10276           
=======================================
+ Hits        48303    48306    +3     
+ Misses      11939    11937    -2     
+ Partials     2438     2437    -1     

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[agarciadiego]

What would this TODO entail?

[dallan-keylogic]

Mostly adding in tests for the values of gp, gn, _teq, and other VLE variables both to make sure the model isn't changing and that the answer is reasonable. Right now, I'm testing that 1) the model initialization doesn't end up with an error and 2) bubble/dew points are not erroneously created.