Enhancement: .F to .F90

[scrasmussen]

TYPE: enhancement

KEYWORDS: build system, filename extension

SOURCE: Soren Rasmussen

DESCRIPTION OF CHANGES:

• .F to .F90 filename change. WRF is moving to CMake with PR#1896 and these changes will make creating the flags for the CMake build easier. Non-standard but communitee standard behavior is to preprocess a file if the extension is capitalized and to treat non .F70 file extensions are free form.
• Small dependency fix to the CMake nudging configuration so the parallel build doesn't break.

TESTS CONDUCTED: Build a few different configuration and ran standard Conus.

NOTE: NoahMP files left unchanged since this will be a submodule soon, hopefully!

Checklist

• [ ] Closes issue #xxxx (An issue must exist or be created to be closed. The issue describes and documents the problem and general solution, the PR describes the technical details of the solution.)
  • [ ] Tests added (unit tests and/or regression/integration tests)
  • [X] Backwards compatible
  • [ ] Requires new files? If so, how to generate them.
  • [ ] Documentation included
  • [ ] Short description in the Development section of NEWS.md

[scrasmussen]

PR #739 has these changes so I'm closing this one.