addition nitrogen stream functionality to datm

[mvertens]

Description of changes

Added nitrogen deposition to datm streams for CLMNDEP, JRA and CORE

Specific notes

Nitrogen deposition is now sent by default from datm to CTSM, POP and MOM6. For now none of the prognostic components will use this field - but this is the first step in removing the component read of ndep from the component itself and obtaining it from an atmospheric component.

Contributors other than yourself, if any: None

CDEPS Issues Fixed: None

Are there dependencies on other component PRs (if so list): No

Are changes expected to change answers (bfb, different to roundoff, more substantial): bfb for now (unless CLM is changed to actually receive this data)

Any User Interface Changes (namelist or namelist defaults changes): only for cime_config

Testing performed (e.g. aux_cdeps, CESM prealpha, etc): the following tests were run and compared to cesm2_3_alpha09b
For CTSM - the data read in was compared to the output when the data was obtained from datm and the results were the same to single precision in comparing the clm history files)

SMS_Ld1.f19_g17.I1850Clm50Bgc.cheyenne_intel
ERS_IOP.T62_g16.GIAF.cheyenne_intel.pop-default
ERS.TL319_t061_wt061.GMOM_JRA_WD.cheyenne_intel

Hashes used for testing: cesm2_3_alpha09b

[mvertens]

@uturuncoglu - this has become a priority to CTSM to get this on master.
Could you please test/review it and make sure that it works for you. Thanks!

[uturuncoglu]

@mvertens Sorry for delay. I took off this afternoon. Anyway, I tested with UFS and run couple of data atmosphere configurations like followings,

• datm_cdeps_control_cfsr
• hafs_regional_datm_cdeps
  and all are passed. So, I think this PR is fine for UFS.

[mvertens]

@uturuncoglu - thanks so much.