Feature 1729 set attr grid

[hsoh-u]

Expected Differences

set_attr_grid was introduced and the configuration was processed. MET libraries were updated partially. The rest of MET libraries were modified to support the set_attr_grid setting. The set_attr_gird setting for gridded data replaces the grid information from the input NetCDF file
The set_attr_gird setting for point data works differently. Instead of stopping point2grid, it continues with the missing grid information with the set_attr_grid setting. But the new grid information is not applied. The actual longitude and latitude variable names should be given via the user defined configuration for point2grid.

• 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:
  

Added two unit tests

/plot_data_plane \
      /d1/projects/MET/MET_test_data/unit_test/model_data/nccf/MITLL.ProxyEchoTopsCalibratedMosaic.20200831_235328_v_20200831_235328.nc \
      EchoTops_set_attr_grid.ps \
      'name="ProxyEchoTopsCalibratedMosaic"; level="(0,*,*)"; set_attr_grid="latlon 8008 4004 -90 -180 0.04 0.04";' \
      -title "Global Synthetic Weather Radar EchoTops" \
      -v 1

./point2grid \
      /d1/projects/MET/MET_test_data/unit_test/model_data/cice/iceh.2018-01-03.c00.tlat_tlon.nc \
      G231 \
      point2grid_cice_to_G231.nc \
      -config /d1/personal/hsoh/git/features/feature_1729_set_attr_grid/MET/internal/test_unit/config/Point2GridConfig_tlat_tlon \
      -field 'name="hi_d"; level="(0,*,*)"; set_attr_grid="latlon 180 360 -80 -180 1 1";' \
      -v 1

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

Test with the real input file which needs the grid definition for certain variables.

The unittest for plot_data_plane uses a gridded data which is not evenly distributed horizontally and vertically.
The input data file the point2grid unittest was generated (by removing the grid information and providing the user configuration:

file_type = NETCDF_NCCF; 

var_name_map = [
  { key = "lat_vname";     val = "TLAT"; },
  { key = "lon_vname";     val = "TLON"; }
];

• 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]

Two unittests were added

• Will this PR result in changes to the MET test suite? [Yes]
  
  If yes, describe the new output and/or changes to the existing output:
  

Two more outputs:

• plot_data_plane/EchoTops_set_attr_grid.ps

• point2grid/point2grid_cice_to_G231.nc

• Will this PR result in changes to existing METplus Use Cases? [No]
  
  If yes, create a new Update Truth METplus issue to describe them.

• Do these changes introduce new SonarQube findings? [No]
  
  If yes, please describe:

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

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[hsoh-u]

Created another feature branch feature_1729_set_attr_grid_v3 and pull request because of differences at some unittest outputs.