Impose range limits on mid-level pressure in MPAS dynamics-physics coupling

[kuanchihwang]

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Originator(s):

kuanchihwang

Descriptions (include the issue title, and the keyword ['closes', 'fixes', 'resolves'] followed by the issue number):

This PR ports a bug fix from ESCOMP/CAM#1304 to CAM-SIMA. In MPAS dynamics-physics coupling, mid-level pressure is not bounded by interface pressure. In high-resolution simulations, the former could exceed the latter, leading to a model crash in physics. Therefore, impose range limits on mid-level pressure to ensure that it is bounded by interface pressure.

Closes #388

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List all existing files that have been modified, and describe the changes:

M       src/dynamics/mpas/dyn_coupling.F90
  * Limit mid-level pressure within the range of interface pressure
  * Remove debugging block
  * Correct code comments

Regression tests:

No changes to any existing tests. All tests pass with respect to the last baseline, sima0_06_000.

[nusbaume]

Thanks @kuanchihwang!