two-stream finidat type restart fixes

[rgknox]

Description:

This set of changes fixes some problems with getting two-stream restarted when using an finidat file (ie non continue_run style). Changes are associated with zenith angle and the signaling during the restart to initialize data structures. This also simplifies how we import (from the host) and use zenith angles (site level zenith angle instead of patch, and removal of superfluous zenith angle flag).

This is an API changing PR, and will need associated PRs on the host side.

Collaborators:

@ckoven

Expectation of Answer Changes:

Should only change two-stream results (will will re-evaluate).

Checklist

If this is your first time contributing, please read the CONTRIBUTING document.

All checklist items must be checked to enable merging this pull request:

Contributor

• The in-code documentation has been updated with descriptive comments
• The documentation has been assessed to determine if updates are necessary

Integrator

• FATES PASS/FAIL regression tests were run
• Evaluation of test results for answer changes was performed and results provided

Documentation

• Technical Note update:
• User's Guide update:

Test Results:

CTSM (or) E3SM (specify which) test hash-tag:

CTSM (or) E3SM (specify which) baseline hash-tag:

FATES baseline hash-tag:

Test Output: