Using the CAM6+DART Reanalysis as forcing for CESM 2.3+

[hkershaw-brown]

Stub of an issue to track what changes if any are needed to use the CAM6+DART Reanalysis as forcing with

CESM 2.3 mct
CESM 2.3 nuopc - Default is nuopc for CESM2.3
CESM 3 (unreleased, nuopc only)

Terminology

CESM Community Earth System Model
CMEPS Community Mediator for Earth Prediction Systems ( a mediator/driver )
NUOPC National Unified Operational Prediction Capability
MCT Model Coupling Toolkit

[hkershaw-brown]

This is just running cesm2_3_beta12 multi-instance with NINST=8

	nuopc	mct
CAM-FV	runs	does not build
CLM	runs	run fails
POP	runs	run fails

/glade/scratch/hkershaw/DART/CESM2.3-plus/CESM/
pop.C_JRA_HR.ens8
cam-fv.FHIST_BGC.ens8
clm.I2000Clm50BgcCropGs.ens8
mct.pop.C_JRA_HR.ens8
mct.clm.I2000Clm50BgcCropGs.ens8
mct.cam-fv.FHIST_BGC.ens8

[kdraeder]

There are related issues in #463, which led to CIME #4409 and CMEPS PRs #378 and #379.