Flexible restart write times (restart_fh) for med, ocn, ice #2419
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Description:
This PR enables writing forecast hour defined restarts ("restart_fh") in the same way as space-delimited floating point forecast hours in model_configure attributes, like
restart_fh: 0.25 2.5 6 17 24
. The implementation builds on current restart_fh in MOM6 for CMEPS, MOM6, and CICE to have option of forecast hour restarts in addition to existing functionality. Restart writes are triggered when input restart_fh forecast hours are evenly divisible by a component's timestep (internally compared in units of integer seconds) and skipped otherwise. Formatting for restart_fh is similar to output_fh (NOAA-EMC/fv3atm#345) but may be moved to ufs.configure once issue with reading list of floating points is resolved (https://github.com/orgs/esmf-org/discussions/291).Testing with cpld_control_gfsv17 confirms that restarts are b4b when (1) sharing common times with RESTART_N and (2) instead of RESTART_N. This option is exercised in the datm_cdeps_gfs RT for med, ocn, ice with restart files added to the baselines for comparison. Baselines are otherwise unchanged.
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