Feature/narnold1/#1155 fix uw tendency

[narnold1]

Limits the UW mass flux based on the CFL condition to reduce occurrence of large tendencies. Tests indicate minimal impact on UMF<0.15 kg/m2/s and temperature increments less than 5K, while UMF>0.2 and increments >10K are almost eliminated.

[mathomp4]

@narnold1 I moved the base of this PR to feature/sdrabenh/gcm_v12 as it seemed to be based on that.

[gmao-rreichle]

@narnold1 : Thanks for the heads-up. No objections from the land team.

[mathomp4]

@narnold1 I moved the base of this PR to feature/sdrabenh/gcm_v12 as it seemed to be based on that.

@narnold1 This might have been a mistake on me because it seems like v12 already has this? The current conflict is:

<<<<<<< feature/narnold1/#1155_fix_uw_tendency -- Incoming Change
            ! Limit umf based on (2x) the CFL condition
            umf(k) = min(umf(k),2.*dp0(k)/g/dt)
            
=======
          ! --------------------------------------------------------- !
          ! Limit umf based on (2x) the CFL condition
          ! --------------------------------------------------------- !
            umf(k) = min(umf(k),2.*dp0(k)/g/dt)

>>>>>>> feature/sdrabenh/gcm_v12 -- Current Change

Did you mean to change this in GEOSgcm v11? Or, perhaps, did this change get into v12 via @wmputman or @sdrabenh from a different route?