Duplicate respiration history variables with incorrect units

[JessicaNeedham]

There are three respiration history variables that are listed twice but with different units, but in each case they use the same index.

FATES_AR ih_aresp_si gC/m^2/s
FATES_AUTORESP ih_aresp_si kg m-2 s-1
FATES_AR_CANOPY ih_ar_canopy_si gC/m^2/s
FATES_AUTORESP_CANOPY ih_ar_canopy_si kg m-2 s-1
FATES_AR_UNDERSTORY ih_ar_understory_si gC/m^2/s
FATES_AUTORESP_USTORY ih_ar_understory_si kg m-2 s-1

e.g.

fates/main/FatesHistoryInterfaceMod.F90

Line 8479 in 43c490d

call this%set_history_var(vname='FATES_AR', units='gC/m^2/s', &

fates/main/FatesHistoryInterfaceMod.F90

Line 8505 in 43c490d

call this%set_history_var(vname='FATES_AUTORESP', units='kg m-2 s-1', &

I think the correct units for all of them are kg m-2 s-1. In FatesPlantRespPhotosynthMod they are calculated as kg C / indiv / ts and in the history routine get converted to m-2 s-1.

This comment is confusing but I think incorrect:

fates/main/FatesHistoryInterfaceMod.F90

Line 5064 in 43c490d

! bulk fluxes are in gC / m2 / s