Create new compsets for NorESM2.3

[gold2718]

CAM will be adding new chemistry schemes (e.g., including Bromoform, including stratospheric chemistry) for the NorESM2.3 release. Create coupled compsets for NorESM 2.3 which use these chemistry schemes.

NorESM2.3 will also support the capability to reproduce KeyClim and FORCeS experiments.

• Details on the new and modified compsets and tests:
  • Google spreadsheet outlining the new compsets (including modifications to N1850 and NHIST)
  • Google spreadsheet outlining the various new features needed for the new experiments
• Relevant branches for this work are:
  • feature-noresm2.0.2_keyClim
  • feature-noresm2.0.2_KeyClim_cloud

The main NorESM2.3 supported compsets will be:

• NHISTfullchem: FORCeS tunings
• N1850fullchem: FORCeS tunings
• N1850FORCeS: FORCeS tunings
• NHISTFORCeS: FORCeS tunings
• N1850: KeyClim 1850 Cloud2
• NHIST: KeyClim 1850 Cloud2

In addition to these compsets, see the AMIP compsets from NorESMhub/CAM#132, NorESMhub/CAM#139, and NorESMhub/CAM#141).