add new multilevel ocean stream input

[mvertens]

Description of changes

add new multilevel ocean stream input

Specific notes

Add new stream mode for MULTILEV for multilevel ocean input. This is needed to couple the CISM Antarctic ice shelf to multi levels of the ocean. A fixed set of vertical levels are assumed and when a prognostic ocean replaces DOCN%MULTILEV then it will have to provide the input salinity and temperature on those vertical levels.

Contributors other than yourself, if any: None

CDEPS Issues Fixed: None

Are there dependencies on other component PRs (if so list): Yes
ESCOMP/CMEPS#456

Are changes expected to change answers: bfb

Any User Interface Changes: Yes - new stream mode DOCN%MULTILEV

Testing performed (e.g. aux_cdeps, CESM prealpha, etc):
Verified that the running the aux_cdeps on derecho was bfb with cdeps1.0.30
Verified that the following case generated the appropriate input for CISM

 ./create_newcase --case /glade/u/home/mvertens/run/test_cism_docn_multi2 --compset 2000_DATM%GSWP3v1_CLM50%SP_SICE_DOCN%MULTILEV_MOSART_CISM2%AIS-EVOLVE%GRIS-EVOLVE_SWAV --project nn9039k -res a%1.9x2.5_l%1.9x2.5_oi%tnx1v4_r%null_g%ais8:gris4_w%nu
ll_z%null_m%tnx1v4 --run-unsupported

• with the caveat that the user_nl_cpl contained the following entries:

ocn2glc_coupling = .true.
histaux_l2x1yrg = .true.

To obtain the code base for this case on derecho:

> git clone https://github.com/mvertens/NorESM.git noresm2_5_alpha02_v2
> cd noresm2_5_alpha02_v2
> git checkout feature/noresm2_5_alpha02_v2
> ./manage_externals/checkout_externals -v