Feature 857 tc stat met config

[georgemccabe]

Added support for new config variables added to TCStat in dtcenter/MET#1734

Pull Request Testing

• Describe testing already performed for these changes:
  

Added unit tests to ensure environment variables used in the wrapped TCStat config file are set properly.

• Recommend testing for the reviewer(s) to perform, including the location of input datasets, and any additional instructions:
  

Review the changes for typos and ensure that the format of the environment variables values are correct.

Also, in tc_stat_wrapper.py in the calls to the add_met_config function, the metplus_configs argument is a list of accepted METplus config variables in priority order. Make note if any other variations of the name should be supported for ease of use.

• Do these changes include sufficient documentation updates, ensuring that no errors or warnings exist in the build of the documentation? [Yes]

• Do these changes include sufficient testing updates? [Yes]

• Will this PR result in changes to the test suite? [No]
  

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[georgemccabe]

Closing because this was created to merge into the wrong branch and the automation didn't trigger when I fixed the destination branch.