Add ISSM ice sheet model GridComp to Landice

[agstub]

This Draft PR adds a new gridcomp that runs ISSM, NASA's Ice-sheet and Sea-level System Model. The ISSM gridcomp is a child of the Landice gridcomp. This Draft PR was spurred by discussions in this issue, which provides an overview and outlines some other changes and development issues.

Overview of the new ISSM gridcomp:
Imports:

• ICESMB (ice surface mass balance) from landice (described below)

Exports:

• ICESURF (ice surface elevation)
• ICETHICK (ice thickness)
• ICEVEL (ice flow speed)
• ICESMB (ice smb on mesh elements, time averaged between ISSM time steps; this is exactly the forcing that ISSM 'feels'; will rename it something different to distinguish mesh and time averaging attributes; also should have units of ice-equivalent [m s-1] while landice is [kg m-2 s-1])
  *These are the main fields/forcing in the underlying PDEs. Other 'requested outputs' can be obtained from ISSM's binary output file by users with the python or Matlab interface if desired.

The ISSM gridcomp does two main things:

1. It calls (C++) IRF methods that are defined in this branch of GMAO's fork of ISSM. The IRF methods are defined here.
2. It creates an ESMF_Mesh version of ISSM's internal (unstructured, triangular) mesh for regridding imports/exports between mesh and the attached grid. The gridded versions of fields are then transformed to landice tile space via MAPL_LocStreamTransform.

Major changes to landice:

1. Added ISSM as a child of Landice. Currently, it is the only child of Landice.
2. Added a new Initialize method that puts the landice tile locstream in the child (ISSM) gridcomp's internal state, and then call's MAPL_GenericInitialize. Landice originally just relies on MAPL_GenericInitialize, so there should be no issues when not running ISSM. Note: The new initialize method is basically a copy of Land gridcomp's Initialize method (with only some comments changed).
3. Added a new ICESMB export, calculated as ACCUM (net ice accumulation rate) minus RUNOFF (runoff total flux). This is exported to ISSM gridcomp.

To Do:

• Discussions with @weiyuan-jiang and @mathomp4 suggest we may need to modify CMakeLists.txt for landice (and issm?) to "stub" the build in case the ISSM module is not present. See PR: v11: Build ISSM based on detection of ISSM #1206

• Added output on mesh tiles via HISTORY: Feature/jiang/issm gridcomp #1209

• Added capability to run over multiple ice sheets, see PRs:

• Run ISSM over multiple input files (multiple ice sheets or glaciers) ISSM#3

• Run ISSM over multiple input files (multiple ice sheets or glaciers) #1216

• Add element coordinates to mesh tile locstream (elementCoords(1::2) and elementCoords(2::2) are the lon/lat coords for each element)

• Fix exports: get issm exports in landice tile space #1212

• Decide if ISSM should be instead be a sibling of Landice for future coupling with ocean (ongoing discussions)

Related Issues and PRs:
Will update these as progress is made:

• Original Github "Issue": GEOSldas+ISSM on Discover GEOSldas#853
• WW3 tag v7.14-geos-r2 fixes an issue causing crash at run time due to incorrect linking. For additional context, see PR: Name mangle BLAS and LAPACK routines WW3#10
• GEOSldas PR: Add ISSM components to LDAS fixture GEOSldas#854
• GEOSgcm PR: v11: Update to ESMA_env v5.18.0 GEOSgcm#1032
• GEOSldas_GridComp PR: Add ISSM fields to HISTORY and initialization arguments GEOSldas_GridComp#161
• MAPL PR: add the options to create locstream with local_id MAPL#4395 Wait for updated release with these changes
• GEOSgcm_App will need PR that introduces changes to HISTORY

[weiyuan-jiang]

To output the fields on Mesh by the way of locstream, this export variable must be in the Mesh space too.ICEEL, Would that be ok? @agstub

[agstub]

To output the fields on Mesh by the way of locstream, this export variable must be in the Mesh space too.ICEEL, Would that be ok? @agstub

Yes, that should be fine