Charlie Koven

Add NBP, TOTECOSYSC, and related summary variables for FATES configurations

2

This PR adds a few new summary variables that include carbon information from FATES as well as soil biogeochemistry and wood product decay when FATES is active: NBP, NEE as...

Hi All, In the AD Spinup routine, there is some logic that is year-dependent (e.g. [here](https://github.com/E3SM-Project/E3SM/blob/master/components/elm/src/biogeochem/DecompCascadeBGCMod.F90#L1035-L1045), [here](https://github.com/E3SM-Project/E3SM/blob/master/components/elm/src/biogeochem/DecompCascadeCNMod.F90#L996-L1006), [here](https://github.com/E3SM-Project/E3SM/blob/master/components/elm/src/biogeochem/DecompCascadeBGCMod.F90#L1086-L1107)), and this logic fails in a way that isn't transparent to the...

This PR is the ELM-side code changes associated with FATES PR https://github.com/NGEET/fates/pull/1407.