Break out thermo consistency tests

[speth]

Changes proposed in this pull request

• Break the thermo consistency tests out into a separate executable
• Suppress most output from these tests by default
• Add a test that covers using the Debye-Huckel model with a temperature and pressure dependent value for A_Debye. Consistency errors in this model are documented in Debye-Hückel cp calculations incorrect when using variable A_Debye #1500 and Debye-Hückel model does not satisfy consistency relationship when using variable A_Debye and "dilute" approximation #1502.

Checklist

• The pull request includes a clear description of this code change
• Commit messages have short titles and reference relevant issues
• Build passes (scons build & scons test) and unit tests address code coverage
• Style & formatting of contributed code follows contributing guidelines
• The pull request is ready for review

[codecov]

Codecov Report

Merging #1501 (b1fd213) into main (13cb334) will increase coverage by 0.28%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1501      +/-   ##
==========================================
+ Coverage   69.48%   69.77%   +0.28%     
==========================================
  Files         377      377              
  Lines       58011    58011              
  Branches    20695    20695              
==========================================
+ Hits        40311    40479     +168     
+ Misses      14748    14577     -171     
- Partials     2952     2955       +3     

Impacted Files	Coverage Δ
src/thermo/WaterPropsIAPWSphi.cpp	93.83% <100.00%> (ø)

... and 3 files with indirect coverage changes

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[ischoegl]

Thank you @speth - apart from the new Debye-Huckel tests, I definitely appreciate separating consistency from other thermo tests, which will make the latter much more tractable.