Feature/virtual towers

[jsauer-NCAR]

Expected Differences

• Do these changes introduce new tools, command line arguments, or configuration file options? [Yes or No]
  
  If yes, please describe:
  

Introduces virtual towers capability targeted in NCAR#108

Pull Request Testing

• Describe testing already performed for these changes:
  

Exercised for ideal Example 2 with 5 towers spanning multiple ranks using cartesian coordinates. Also tested on large multiscale domain with multiple towers spanning multiple ranks using lat/lon coordinate specification. Post-processing script verified for the latter workflow across 19 towers.

• Recommend testing for the reviewer(s) to perform, including the location of input datasets, and any additional instructions:
  
  None

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

Documentation to be added to the NCAR feature.

• Do these changes include sufficient testing updates? [Yes or No]
  N/A

• Will this PR result in changes to the test suite? [Yes or No]
  
  If yes, describe the new output and/or changes to the existing output:
  

No

• Please complete this pull request review by [Fill in date].
  

Pull Request Checklist

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