Bugfix #2115 main_v10.1 Rotated LatLon

[JohnHalleyGotway]

Expected Differences

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

• Do these changes modify the structure of existing or add new output data types (e.g. statistic line types or NetCDF variables)? [No]
  
  If yes, please describe:
  

Pull Request Testing

• Describe testing already performed for these changes:
  
  Confirmed that plot_data_plane now plots the rotated lat/lon data over the UK in the proper location. Also confirmed that the rotated lat/lon India test data produces that same result as before.

• Recommend testing for the reviewer(s) to perform, including the location of input datasets, and any additional instructions:
  
  Could retrieve prods_op_ukv_rotated_latlon_20220301_00_000.nc and run:

plot_data_plane prods_op_ukv_rotated_latlon_20220301_00_000.nc plot.ps 'name="surface_altitude"; level="(*,*)";'

And confirm that the data aligns with the map.

• Do these changes include sufficient documentation updates, ensuring that no errors or warnings exist in the build of the documentation? [Yes or No]
  None needed.

• Do these changes include sufficient testing updates? [No]
  No change in this PR but I added a new unit test for the develop branch.

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

• Please complete this pull request review by [4/1/22].
  

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[jprestop]

I reviewed the file that changed. I retrieved the prods_op_ukv_rotated_latlon_20220301_00_000.nc file and ran the plot_data_plane command to confirm that the data aligns with the map. I approve this pull request.