Clean up prior runs

[bikegeek]

Describe the Enhancement

When making multiple identical requests, consider removing pre-existing data from the output directory.

Other things to consider:
generate a warning to users to allow saving output

Time Estimate

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Issues should represent approximately 1 to 3 days of work.

Sub-Issues

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Relevant Deadlines

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Funding Source

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Define the Metadata

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Milestone and Projects

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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>
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