Enhancement: PCPCombine wrapper - allow missing inputs

[georgemccabe]

dtcenter/MET#2883 will modify the MET PCP-Combine tool to allow missing input files.

Describe the Enhancement

Update the PCPCombine wrapper to:

• Allow missing input files (set MISSING/path/to for files that are not found)
• Set input threshold (input_thresh)
• Set valid threshold (vld_thresh)?
• Consider not allowing missing inputs if input_thresh is unset or set to require all files

Time Estimate

Estimate the amount of work required here. Issues should represent approximately 1 to 3 days of work.

Sub-Issues

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Relevant Deadlines

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Funding Source

2799991

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Define Related Issue(s)

Consider the impact to the other METplus components.

• [ ] METplus, MET, METdataio, METviewer, METexpress, METcalcpy, METplotpy

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.
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