Add new RRSwISC6to18E3r1 ocean and sea-ice mesh

[xylar]

Long name: RRSwISC6to18L80E3SMv3r1

This RRS (Rossby-radius scaled) mesh has:

• 6 km resolution near the poles
• 18 km resolution at the equator

This is a proposed E3SM v3 (E3) high resolution (near-eddy-resolving) mesh. This is revision 1 (r1) of the mesh, since we caught and fixed the issues with Greenland topography (seen in earlier revisions of EC and Icos meshes) before any substantial testing was performed.

The mesh was created using compass, specifically this PR:
MPAS-Dev/compass#668
A compass tag will be created for the mesh as soon as the PR is merged.

The mesh and forthcoming simulation results will be reviewed here:
https://acme-climate.atlassian.net/wiki/spaces/OO/pages/3894149135/Review+RRSwISC6to18E3r1

G- and B-case simulations will begin shortly and analysis will be posted here and on the review page as soon as it is available.

[xylar]

Moved from E3SM-Ocean-Discussion#59, which has a small amount of relevant discussion.

[rljacob]

Lots of map names need to change to follow our new convenction. Anything with "pg2" and "mono" is really "traave". The "bilin" should be "trbilin".

[rljacob]

This should be renamed to "traave" instead of "mono".

[jonbob]

@rljacob -- I'll regenerate the mapping files to match the new algorithms and naming convention

[mt5555]

the atm2ocn flux map might have the blocky grid imprinting issue in coupled simulations (for the low-res ne30pg2 atmosphere coupled to this new ocean grid)
(i.e. https://acme-climate.atlassian.net/wiki/spaces/ECG/pages/2350776353/2-17-2021+Cryosphere+Simulation+Campaign )

if this is used for coupled simulations we may want to consider upgrading the atm2ocn map to a "nonlinear" flux map:
https://acme-climate.atlassian.net/wiki/spaces/COM/pages/3771301899/Coupler+High-order+property-preserving+maps

[xylar]

@jonbob, I think these comments are things you may be able to best address. Feel free to push to this branch.

[proteanplanet]

I have reviewed bathymetry, narrow passages, and ice shelf cavities both numerically and visually. Summary plots are provided below for packaging with this PR and later referral. Approved for the magnificent quality of the mesh.

[xylar]

@proteanplanet, I appreciate you posting these plots! I'd request that you hold off on approving the mesh, though, until we've done some forward simulations (preferably fully coupled) so we can see what the behavior is like. I have put this up so that reviewers can approve this PR and the associated columns in the confluence document together. I didn't have a chance to explain this to you all, I'm afraid. I was just asked to make this mesh the next priority earlier today.

[xylar]

I'm putting this in draft mode because I just discovered a bug in landIceMask (which affects the initial condition as well as several mapping files) over the weekend.

MPAS-Dev/compass#732

[xylar]

Closing this because of the landIceMask bug. We will generate a new version with the bug fixed in the new year.