Feature/bmauer/identify vertical coord extdata2g

[bena-nasa]

This is the first PR to get a beta version of proper vertical constituent regridding into ExtData2G. It seemed like it was time for a pause to get this in now that it is getting really big and I have a few cases working.

Basically the idea as follows.
I have redone the detection of the vertical level in the file, and identify it according to CF as either hybrid sigma, fixed pressures/heights etc, or just "simple" coordinate if it doesn't follow either of those according to the letter of CF in new code.

If it is hybrid sigma, then that means there is a surface pressure and ak/bk in the file (note that I'm not entirely satisfied with the format for the file I coded to, I tried to follow CF, but might want to change; see plan at end of issue). I add a new rule, borrowing the original items parameters to read PS like any other item, so it gets regridded, time interpolated etc.
Then after the time interpolation I check if hybrid sigma, then regrid.
This so far has limited functionality and supports regridding from a file on hybrid sigma levels as defined by the CF conventions with a time varying pressure and ak/bk in the file. It only supports constituents in either mass mixing ratios: kg kg-1 or mass per area per second. I.E. kg m-2 s-1. This uses the ppm code (brought a version into MAPL) from FV3 to conservatively regrid and also has corrections at the surface to ensure that mass is conserved.

I can go into greater detail what is being done here if needed.

In addition, in order for this feature to be usable ExtData must import PLE. This can be accomplished using the version Kyle added to the Cap by specify this in the CAP.rc file

CAP_EXPORTS:
PLE,DYN
::

EXTDATA_IMPORTS:
PLE,DYN
::

I have been testing this all along for 0 diff.
This is the first hopefully what will be much more frequent PR's now once this is in. The plan is as follows:

• Implement Volume mixing regridding mol mol-1 (will require importing Q from model, and reading time varying Q from file), and reading species molecular weight from file.
• Decide if we are happy with the metadata requirements, it not change it at this step I don’t want to have to change it later. What input types we need to support:
  1. Hybrid sigma levels defined by CF
  2. Fixed levels (either pressure or height) as defined by CF. Can also define edge boundaries via 7.1 of CF convention
• Add support for hybrid sigma levels with a file containing a time dependent PLE rather than PS/AK/BK
• Implement fixed pressure level regridding
• Add support for fixed heights (regrid via ZLE)

Types of change(s)

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Trivial change (affects only documentation or cleanup)
• Refactor (no functional changes, no api changes)

Checklist

• Tested this change with a run of GEOSgcm
• Ran the Unit Tests (make tests)

Description

Related Issue

[tclune]

Please answer the one inline question I asked before merging. And the very small suggestion edits. (capitalize params)

And ... you are now not allowed to leave NASA until your knowledge is captured in MAPL3 on this front.