feature 794 change master_metplus to run_metplus

[georgemccabe]

changed all instances of master_metplus to run_metplus

Pull Request Testing

• Describe testing already performed for these changes:
  

Ran a few use cases and verified they still ran properly
Verified that a warning message is output when running master_metplus.py

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

Run some use cases using run_metplus.py and master_metplus.py and ensure that everything looks correct using either script
Run master_metplus.py and ensure warning message is sufficient

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

Updated documentation to use run_metplus.py

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

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[jprestop]

I reviewed the files changed. On kiowa in /d1/projects/METplus/METplus_pull_requests/METplus-4.0.0-beta4/feature_794, Iran two use cases:
*use_cases/met_tool_wrapper/GenVxMask/GenVxMask_multiple.py
*use_cases/met_tool_wrapper/ASCII2NC/ASCII2NC.conf
using run_metplus.py and master_metplus.py ensured that everything looks correct using either script.

When running master_metplus.py, I saw the warning message:
"02/17 14:46:53.060 metplus (master_metplus.py:50) WARNING: master_metplus.py has been renamed to run_metplus.py. This script name will be removed in a future version."
which seems sufficient.

I did notice that the version seems to be set to "4.0.0-rc1-dev":
"Running METplus 4.0.0-rc1-dev"
which was probably me setting that after the beta3 release before we knew there was going to be a beta4 release. I don't know that it should be fixed in this feature branch, but I at least wanted to mention it. Do you want me to fix that in the develop branch?