Allow none mapalgo

[adrifoster]

Description of changes

Allow none to be an option for mapalgo in the user_nl_datm_streams namelist file.

Specific notes

For single-point runs of CTSM, we need to be able to set foo:mapalgo=none , where foo is the stream name. I added none as an option to cime_config/stream_cdeps.py here:

valid_values["mapalgo"]  = ["bilinear", "nn", "redist", "mapconsd", "mapconf", "none"]

Contributors other than yourself, if any:
@billsacks and @ekluzek

CDEPS Issues Fixed (include github issue #): #134

Are there dependencies on other component PRs

• CIME (list)
• CMEPS (list)

Are changes expected to change answers?

• bit for bit
• different at roundoff level
• more substantial

Any User Interface Changes (namelist or namelist defaults changes)?

• Yes - we allow mapalgo=none in the user_nl_datm_streams namelist
• No

Testing performed:

• (required) aux_cdeps
  • machines and compilers:
  • details (e.g. failed tests):
• (optional) CESM prealpha test
  • machines and compilers
  • details (e.g. failed tests):

Hashes used for testing:

• CIME
  • repository to check out: https://github.com/ESCOMP/CESM.git
  • branch:
  • hash:
• CMEPS
  • repository to check out: https://github.com/ESCOMP/CESM.git
  • branch:
  • hash:
• CESM
  • repository to check out: https://github.com/ESCOMP/CESM.git
  • branch:
  • hash:

[ekluzek]

I'm going to run the testing for this. I can't edit the original notes, but I'll add new notes here:

The externals I'm testing with are:

cime6.0.11
cmeps0.13.43
CTSM5.1.dev068

And I'll run aux_cdeps. I'll make sure that there is a test for this new option as well.

And I plan to look into #135 if it's easy to add to this.