Adds E and I compsets for BGC experiments

[bishtgautam]

Adds following three compsets needed in preparation of
the ACME BGC experiments:

E1850C5CNECACTCBC
E20TRC5CNECACTCBC
IM20TRCNECACTCBC

[BFB]
[NML]

[bishtgautam]

@xtcai : I have been able to successfully create new cases for all three compsets at -res f09_g16. Can you verify the CLM_BLDNML_OPTS for all three cases is as expected? Thanks.

[acme-y9s]

@bishtgautam Could you please explain what is the E compset ?

[bishtgautam]

@acme-y9s : E-compset is with a slab ocean model.

[bishtgautam]

@xtcai: For the record, could you confirm that you were able to successfully create cases for all three compsets? Thanks.

[xtcai]

@bishtgautam The two E-compsets (E1850C5CNECACTCBC and E20TRC5CNECACTCBC) were verified OK. The IM20TRCNECACTCBC I-compset has a bug with P imbalance.

[bishtgautam]

@xtcai: The P balance is a physics-specific error, but at least your were able to successfully create a IM20TRCNECACTCBC compset.

[xtcai]

@bishtgautam Yes. That's correct.

[rljacob]

Hang on @xtcai. Only integrators can make merges to master.

[rljacob]

DO NOT REVERT IT

[xtcai]

@rljacob Sorry. I saw the big green "Merge" button and thought it was the task assigned to me.