Add harmonic pre-processing to the RMM use case

[CPKalb]

Describe the Enhancement

Add harmonic pre-processing to the RMM use case. The pre-processing will be done on the forecast data. Also add forecast data to the OMI use case

Time Estimate

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Issues should represent approximately 1 to 3 days of work.

Sub-Issues

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None

Relevant Deadlines

METplus 4.1.0

Funding Source

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Define Related Issue(s)

Consider the impact to the other METplus components.

• METplus, MET, METdatadb, 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.
• Add/update log messages for easier debugging.
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• Close this issue.