Fix set_parameter_path in Helmholtz Property Package

[bertkdowns]

Fixes

Fix the set_parameter_path() function in helmholtz.
update helmholtz_functions.py and helmholtz_state.py to use the latest cfg variable rather than storing a copy

Summary/Motivation:

the set_parameter_path function does not properly update the helmholtz parameter file path, because it sets idaes.properties.helmholtz.parameter_file_path rather than idaes.cfg.properties.parameter_file_path (note .cfg).

Also, helmholtz_functions.py makes a copy of the cfg variable into _data_dir, which also is not updated with set_parameter_path.

This involves needing to do some hacky workarounds to specify a different directory to load helmholtz data from (e.g see my register_compounds function.

Changes proposed in this PR:

• The _data_dir variable is replaced with a function that gets the config variable
• The set_parameter_path function is fixed to update the config variable correctly
• the compounds are auto-registered, as specified in the set_parameter_path documentation

Legal Acknowledgement

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1. I agree my contributions are submitted under the license terms described in the LICENSE.txt file at the top level of this directory.
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.

[dallan-keylogic]

@bertkdowns Could you please format your PR with Black? I'd like to see if it breaks the CI.

[bertkdowns]

@bertkdowns Could you please format your PR with Black? I'd like to see if it breaks the CI.

done, and the pytest tests passed on my machine, except for the ones that required the petsc solver as I didn't have it installed

[dallan-keylogic]

Looks like tests are passing, random Keras/multithreading errors nonwithstanding. @eslickj , if you get a chance, could you take a look to see if this breaks anything? At any rate, we should probably wait until after the 2.7 release to merge this.

[ksbeattie]

@lbianchi-lbl , I think you were going to take a look at this (when you get back)?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 92.15686% with 4 lines in your changes missing coverage. Please review.

Project coverage is 77.02%. Comparing base (f92c750) to head (c293cba).

Files with missing lines	Patch %	Lines
...eneral_helmholtz/components/parameters/__init__.py	0.00%	2 Missing ⚠️
...roperties/general_helmholtz/helmholtz_functions.py	95.91%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1530      +/-   ##
==========================================
+ Coverage   76.99%   77.02%   +0.02%     
==========================================
  Files         385      387       +2     
  Lines       62288    62532     +244     
  Branches    10216    10241      +25     
==========================================
+ Hits        47957    48163     +206     
- Misses      11911    11936      +25     
- Partials     2420     2433      +13     

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[eslickj]

As far as I can tell it looks good.