Pertlim fix for MPAS

[patcal]

Closes #1109

[jtruesdal]

This mods are fine. @cacraigucar I was surprised that there aren't pertlim regression tests since ensembles are an important part of climate analysis. I'll bring that up in our SE meeting and see if we need an issue to provide testing for all supported dycores. Since we don't have testing currently in place please run your own test to make sure that the pertlim namelist addition is working correctly and document this in your Changelog.

[cacraigucar]

@patcal - Could you please provide a test that you ran with this new pertlim that we can use as a basis of a CAM regression test?

[patcal]

The test I ran was for a user-defined MPAS grid and user-generated input files, so I don't think it is feasible for a standard regression test. I have not checked to see if there is a functional implementation of a uniform low-res MPAS grid in the current tag. If there is, then I can set up a test using it.

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[cacraigucar]

@patcal - Have you made any progress on creating a regression test? This PR is stalled until we get one made