Enhance Point2Grid to filter quality control strings with config file options

Describe the Enhancement

While developing a wrapper for the Point2Grid tool via dtcenter/METplus#2540, a short-coming in the Point2Grid configuration file was discovered. Please see this issue comment for details. Put simply, the existing quality_mark_thresh config file option should be replaced by the obs_quality_inc and obs_quality_exc config file options supported for the Point-Stat and Ensemble-Stat tools.

Be sure to update the unit tests to demonstrate these options and update the documentation accordingly.

Time Estimate

1 day

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Relevant Deadlines

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Define Related Issue(s)

Consider the impact to the other METplus components.

[x] METplus, MET, METdataio, METviewer, METexpress, METcalcpy, METplotpy
[x] dtcenter/METplus#2540 already exists to add a Point2Grid wrapper.

Enhancement Checklist

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[ ] Complete the issue definition above, including the Time Estimate and Funding Source.
[ ] Fork this repository or create a branch of develop. Branch name: feature_<Issue Number>_<Description>
[ ] Complete the development and test your changes.
[ ] Add/update log messages for easier debugging.
[ ] Add/update unit tests.
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[ ] Close this issue.

dtcenter / MET