GFDL MP slow/fast processes cleanup work

[climbfuji]

(1) gfdl_cloud_microphys.F90, gfdl_fv_sat_adj.F90 and gfdl_fv_sat_adj_pre.F90 still use constants imported from other modules, these should come in via the argument list

(2) in gfdl_fv_sat_adj.F90, a preprocessore directive testing for the host model identifier is used to determine whether to open an OpenMP parallel region or not. Ideally, one would test using OpenMP code if the calling function already opened a parallel region or not.

[climbfuji]

(3) The CCPP version of GFDL MP crashes in NEMSfv3gfs when do_sat_adj is set to .false. I believe this has to do with the initialization:

   if (Atm(mytile)%flagstruct%do_sat_adj) then
      ! Initialize fast physics
      call ccpp_physics_init(cdata, group_name="fast_physics", ierr=ierr)
      if (ierr/=0) then
         call mpp_error (FATAL,' atmosphere_dynamics: error in ccpp_physics_init')
      end if
   end if

This block in atmosphere.F90 is responsible for the fast physics init, which also calculates the lookup tables that are used in the standard-physics gfdl_cloud_microphysics.F90.

[climbfuji]

(3) is solved, (1) is partially solved and will be addressed in #104. (2) is not yet solved, requires to know how to use OpenMP pragmas to detect if inside a parallel region or not.

[climbfuji]

Closing this due to a lack of activity here, but a lot of activity adding new versions of the scheme,