Feature #2277 python_warning

[JohnHalleyGotway]

Wrote a utility function python_compile_error() to print a consistent error message about python support not being compiled. Updated code to call it from ensemble_stat, point_stat, point2grid, plot_point_obs, ascii2nc, and the vx_data2d_factory.

Note I also included some unrelated changes to the documentation for the CRPS_EMP_FAIR statistic that arose in another context.

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:
  
  • Ran all unit tests through GHA and confirmed no diffs were flagged.
  • Compiled this feature branch locally WITHOUT python embedding support compiled and tested...
    ascii2nc

bin/ascii2nc -format python 'scripts/python/read_ascii_point.py data/sample_obs/ascii/sample_ascii_obs.txt' out.nc
ERROR  : 
ERROR  : set_format() -> Support for Python has not been compiled!
ERROR  : To run Python scripts, recompile with the --enable-python option.
ERROR  : 

plot_point_obs

bin/plot_point_obs 'PYTHON_NUMPY=scripts/python/read_ascii_point.py data/sample_obs/ascii/sample_ascii_obs.txt' out.ps
ERROR  : 
ERROR  : process_point_obs() -> Support for Python has not been compiled!
ERROR  : To run Python scripts, recompile with the --enable-python option.
ERROR  : 

point2grid

bin/point2grid 'PYTHON_NUMPY=scripts/python/read_ascii_point.py data/sample_obs/ascii/sample_ascii_obs.txt' G212 out.nc
ERROR  : 
ERROR  : process_command_line() -> Support for Python has not been compiled!
ERROR  : To run Python scripts, recompile with the --enable-python option.
ERROR  : 

And I stopped there.

• Recommend testing for the reviewer(s) to perform, including the location of input datasets, and any additional instructions:
  
  Please review code changes and confirm that all unit tests run via GHA and produce no differences.

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

• Do these changes include sufficient testing updates? [No]
  None needed.

• 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 [Mon 10/7/22].
  

Pull Request Checklist

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[hsoh-u]

The error message was changed for ascii2nc

ERROR  : set_format() -> unsupported ASCII observation format "python".

to

ERROR  : set_format() -> Support for Python has not been compiled!
ERROR  : To run Python scripts, recompile with the --enable-python option.