CIME branch for NorESM2.3

[DirkOlivie]

@mvertens @gold2718

To introduce bromoform into NorESM2.3, also CIME has to be modified. Currently NorESM2.3 refers in Externals.cfg for CIME to the tag cime5.6.10_NorESM2_3_r2.

Can I start from that tag cime5.6.10_NorESM2_3_r2 a branch called noresm2_3_develop?

[TomasTorsvik]

@DirkOlivie , @gold2718 , @mvertens - I didn't see this one until now, it was not attached to the NorESM Development project. The latest CIME tag for NorESM2.3 is cime5.6.10_NorESM2.3.0_v1, and is up to date with the noresm2_3_develop branch.