add cnclm51 remapping; provide default "zoom" value for remap_restarts yaml file

[weiyuan-jiang]

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[github-actions]

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[weiyuan-jiang]

This PR should go with this PR GEOS-ESM/GEOSgcm_GridComp#1129

[gmao-rreichle]

@weiyuan-jiang : I added one commit (4c5441c; please review) and a comment, see below.

[biljanaorescanin]

@weiyuan-jiang last commit, reinstating subroutine fixed the issue.

[gmao-rreichle]

@weiyuan-jiang last commit, reinstating subroutine fixed the issue.

@weiyuan-jiang , @biljanaorescanin : I assume you ran into problems because are running GEOSldas with the cnclm51 branch, where get_gridname() is used. I had commented out get_gridname() because it was not used in GEOS_Util. I hadn't realized that it is used in ldas.py of GEOSldas_GridComp. While re-instating get_gridname() in GEOS_Util fixes the issue, I don't think it's the right solution. In ldas.py, get_gridname() is needed for HISTORY pre-processing, which has nothing to do with remap_restarts or GEOS_Util. I think we should move get_gridname to ldas.py. @weiyuan-jiang, does this make sense?

[gmao-rreichle]

PS: Or maybe get_gridname() would fit better into the make_bcs package? It's really some sort of reader of the *.til file. I don't know if we have a full py reader for the *.til file. If that exists, perhaps it could be modified to optionally only read the "grid_name" info. Also, the *.til file contains two grid names, the atm grid and the ocean grid. We should probably be clearer about get_gridname() only reading the name of the atm grid.

[weiyuan-jiang]

PS: Or maybe get_gridname() would fit better into the make_bcs package? It's really some sort of reader of the *.til file. I don't know if we have a full py reader for the *.til file. If that exists, perhaps it could be modified to optionally only read the "grid_name" info. Also, the *.til file contains two grid names, the atm grid and the ocean grid. We should probably be clearer about get_gridname() only reading the name of the atm grid.

Since it is called only by ldas_setup, I can move it to setup_utills

[biljanaorescanin]

Zero diff testing with remap_package passed.