DASSH-py to DASSH-F upgrade

Prerequisites Checklist

Self-review checklist:

• My code follows the style guidelines and software coding standards for this project.
• I have performed a self-review of my code.
• I have commented my code, particularly in hard-to-understand areas.
• I have added appropriate tests that prove my fix/feature is effective.
• If the source branch will not be used after this MR, I have set it to be deleted upon merging.

Documentation checklist:

• I have checked the README and updated it if necessary.
• I have checked the tutorial and made any documenation or results updates if necessary.
• I have updated the CHANGELOG.

Does this MR relate to a specific issue? If so, link the issue.

Fixes # (issue)

Description of Changes

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected or break backwards compatibility)

Additional Information

The long awaited DASSH-F upgrade MR (first of two)!

This is going into a temporary branch for review as it currently contains just precheck, prerun, and run changes (no postrun). The tutorial is updated to the best of my ability and would be a good starting place for review.

All the changes/suggestions from @nstauff and @kramey should be implemented. But I will mark a few places in the files where I need some input and/or want to provide a little more context for ease of reviewing.