Bring tmp-branch to master

Bring in changes that came in on the tmp-240620 branch to master now that cesm3_0_beta01 has been made.

The changes are documented in tags and the ChangeLog but include the following tags:

  tmp-240620.n03.ctsm5.2.007 samrabin -- upland hillslope column fsat values to zero
  tmp-240620.n02.ctsm5.2.007 erik ------ Another update of git-fleximod
  tmp-240620.n01.ctsm5.2.007 slevis ---- Merge b4b-dev

This reverts commit d940ee0
because answers were changing from the baseline in tests
ERS_D_Ld15.f45_f45_mg37.I2000Clm50FatesRs.derecho_intel.clm-FatesColdTwoStream
ERS_D_Ld15.f45_f45_mg37.I2000Clm50FatesRs.izumi_nag.clm-FatesColdTwoStream

Relax tolerance for truncating small snocan values in CanopyFluxes

See the PR ESCOMP#2457 for details.

I used this test to confirm same answers:
./create_test ERS_D_Ld15.f45_f45_mg37.I2000Clm50FatesRs.derecho_intel.clm-FatesColdTwoStream -c /glade/campaign/cgd/tss/ctsm_baselines/ctsm5.2.012
This test had indicated differences with an earlier commit that
I subsequently reverted.

Dust emissions control moved to cmeps

Remove the dust emissions namelist items from CTSM and use the namelist in the drv_flds_in for CMEPS.

This updates CTSM to use the namelist control in CMEPS (in ESCOMP/CMEPS#429). So the CMEPS external needs to be updated, and the
namelist control in CTSM changed to use CMEPS rather than the internal CTSM control settings and the CTSM ones removed.

The new XML variable:

   LND_SETS_DUST_EMIS_DRV_FLDS

controls whether dust emission settings are set by CTSM or by CAM. Only one or the other can set them, and it's required so when CAM
and CTSM are running together they need to know which one will select.

This required some changes for LILAC. The drv_flds_in namelist file is now required for LILAC, and read for dust emissions
(and dust emissions only) at the LILAC lnd_comp_esmf.F90 level.

Add a unit test for the CMEPS code to make sure it's working correctly. This validates the code both for CAM and CTSM.

Fix the cidinahoBR test in the build-namelist unit tester.

slevis resolved conflicts:
doc/ChangeLog
doc/ChangeSum