Add the restart capability to job JGFS_ATMOS_POSTSND

[BoCui-NOAA]

Description

This PR will add the restart capability to job JGFS_ATMOS_POSTSND. This job will create a restart directory under ptmp ($DATAROOT). Some log files and midterm products are saved and will be used once a re-run starts.

Resolves #1257

Type of change

• New feature (adds functionality)

Change characteristics

• Is this a breaking change (a change in existing functionality)? NO
• Does this change require a documentation update? NO

How has this been tested?

• Cycled test on WCOSS2

Checklist

• [ ] Any dependent changes have been merged and published
• [ ] My code follows the style guidelines of this project
• [ ] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] My changes generate no new warnings
• [ ] New and existing tests pass with my changes
• [ ] I have made corresponding changes to the documentation if necessary

[WalterKolczynski-NOAA]

Bo and I are going to look at it more carefully and try to break this into one a metatask/family with one forecast hour per job followed by a finalization job to create the final tarballs. This will improved computational efficiency and should eliminate the need for restart capability (for the time being).