Feature 1828 use case cocorahs

[j-opatz]

Pull Request Testing

• Describe testing already performed for these changes:
  Ran use case with METplus paths, checked documentation for accuracy

• Recommend testing for the reviewer(s) to perform, including the location of input datasets, and any additional instructions:
  check documentation here:
  make sure that the only errors in automated testing are the new files.
  If you'd like, you can run the use case. Data is on seneca, under /d1/personal/jopatz/model_applications

• Do these changes include sufficient documentation updates, ensuring that no errors or warnings exist in the build of the documentation? [Yes]

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

• Will this PR result in changes to the test suite? [Yes]
  
  If yes, describe the new output and/or changes to the existing output:
  New truth data

• Please complete this pull request review by [Fill in date].
  11/07 COB

Pull Request Checklist

See the METplus Workflow for details.

• Add any new Python packages to the METplus Components Python Requirements table.
• Review the source issue metadata (required labels, projects, and milestone).
• Complete the PR definition above.
• Ensure the PR title matches the feature or bugfix branch name.
• Define the PR metadata, as permissions allow.
  Select: Reviewer(s)
  Select: Organization level software support Project or Repository level development cycle Project
  Select: Milestone as the version that will include these changes
• After submitting the PR, select Development with the original issue number.
• After the PR is approved, merge your changes. If permissions do not allow this, request that the reviewer do the merge.
• Close the linked issue and delete your feature or bugfix branch from GitHub.

[hankenstein2]

Ran on seneca and got expected results, all tests except missing data check successfull.