[GCMPY] New PLOT_P at NCCS depending on model

[mathomp4]

There was a change in gcm_setup recently:

              setenv    POST_P  "SBATCH --nodes=1 --ntasks-per-node=${NCPUS_PER_NODE}"        # PE Configuration for gcm_post.j
              if      ($MODEL == 'mil') then
                 setenv PLOT_P  "SBATCH --constraint=${MODEL} --nodes=1 --ntasks-per-node=24 --mem=488G"  # PE Configuration for gcm_plot.j
              else if ($MODEL == 'cas') then
                 setenv PLOT_P  "SBATCH --constraint=${MODEL} --nodes=1 --ntasks-per-node=10 --mem=185G"  # PE Configuration for gcm_plot.j
              else
                 setenv PLOT_P  "SBATCH --nodes=4 --ntasks=4"                                 # PE Configuration for gcm_plot.j
              endif

where the POST_P and PLOT_P changed to now be different per model (milan vs cas).

I'll assing @JulesKouatchou so he knows