Corrected the rescaling of 5 KPP diagnostics

  Added missing factors to the conversion arguments in the register_diag_field
calls for the diagnostics of the KPP non-local transport tendency and the net
surface tracer fluxes, and corrected the dimensional scaling that is being
applied to the KPP_Vt2 diagnostic as calculated in KPP_compute_BLD.  All
solutions are bitwise identical, but now output files with these 3 sets of KPP
diagnostics are invariant to dimensional rescaling.  This can be verified with
the visc.nc file generated by the single_column/KPP test case in MOM6-examples.
Whereas previously the diagnostics KPP_Vt2, KPP_QminusSW, KPP_netSalt,
KPP_NLT_dTdt and KPP_NLT_dSdt in that file would change when dimensional
rescaling was applied, now they do not.  No output is changed unless dimensional
rescaling is used.

src/parameterizations/vertical/MOM_CVMix_KPP.F90

@@ -1296,7 +1296,7 @@ subroutine KPP_compute_BLD(CS, G, GV, US, h, Temp, Salt, u, v, tv, uStar, buoyFl
                     bfsfc=surfBuoyFlux, & ! surface buoyancy flux [m2 s-3]
                     uStar=surfFricVel,  & ! surface friction velocity [m s-1]
                     CVmix_kpp_params_user=CS%KPP_params ) ! KPP parameters
-        CS%Vt2(i,j,:) = US%m_to_Z*US%T_to_s * Vt2_1d(:)
+        CS%Vt2(i,j,:) = US%m_to_Z**2*US%T_to_s**2 * Vt2_1d(:)
       endif
 
       ! recompute wscale for diagnostics, now that we in fact know boundary layer depth

src/tracer/MOM_tracer_registry.F90

@@ -586,11 +586,11 @@ subroutine register_tracer_diagnostics(Reg, h, Time, diag, G, GV, US, use_ALE, u
     ! KPP nonlocal term diagnostics
     if (use_KPP) then
       Tr%id_net_surfflux = register_diag_field('ocean_model', Tr%net_surfflux_name, diag%axesT1, Time, &
-          Tr%net_surfflux_longname, trim(units)//' m s-1', conversion=GV%H_to_m*US%s_to_T)
+          Tr%net_surfflux_longname, trim(units)//' m s-1', conversion=Tr%conc_scale*GV%H_to_m*US%s_to_T)
       Tr%id_NLT_tendency = register_diag_field('ocean_model', "KPP_NLT_d"//trim(shortnm)//"dt", &
           diag%axesTL, Time, &
           trim(longname)//' tendency due to non-local transport of '//trim(lowercase(flux_longname))//&
-          ', as calculated by [CVMix] KPP', trim(units)//' s-1', conversion=US%s_to_T)
+          ', as calculated by [CVMix] KPP', trim(units)//' s-1', conversion=Tr%conc_scale*US%s_to_T)
       if (Tr%conv_scale == 0.001*GV%H_to_kg_m2) then
         conversion = GV%H_to_kg_m2
       else