Add more ocean variables for post-processing in GEFS (NOAA-EMC#2995)

This PR adds an ocean variable `tob` (Sea Water Potential Temperature at
Sea Floor) for post-processing in GEFS, which is a variable that has
been requested for GEFSv13 and the reforecast.

Also, this PR moves the atmos variable `PEVPR` from the "b" group to the
"a" group of pgrb products in GEFS. This was requested by a reforecast
stakeholder.

Resolves NOAA-EMC#2993

parm/post/oceanice_products_gefs.yaml

@@ -33,7 +33,7 @@ ocean:
     {% elif model_grid == 'mx500' %}
     ocean_levels: [5, 15, 25, 35, 45, 55, 65, 75, 85, 95, 105, 115, 125, 135, 145, 155, 165, 175, 185, 195, 205, 215, 226, 241, 267]
     {% endif %}
-  subset: ['SSH', 'SST', 'SSS', 'speed', 'MLD_003', 'latent', 'sensible', 'SW', 'LW', 'LwLatSens', 'Heat_PmE', 'SSU', 'SSV', 'taux', 'tauy', 'temp', 'so', 'uo', 'vo']
+  subset: ['SSH', 'SST', 'SSS', 'speed', 'MLD_003', 'latent', 'sensible', 'SW', 'LW', 'LwLatSens', 'Heat_PmE', 'SSU', 'SSV', 'taux', 'tauy', 'temp', 'tob', 'so', 'uo', 'vo']
   data_in:
     copy:
       - ["{{ COM_OCEAN_HISTORY }}/{{ RUN }}.ocean.t{{ current_cycle | strftime('%H') }}z.{{ interval }}hr_avg.f{{ '%03d' % forecast_hour }}.nc", "{{ DATA }}/ocean.nc"]

parm/product/gefs.0p25.fFFF.paramlist.a.txt

@@ -19,6 +19,7 @@
 :CIN:180-0 mb above ground:
 :CIN:surface:
 :HLCY:3000-0 m above ground:
+:PEVPR:surface:
 :TCDC:entire atmosphere (considered as a single layer):
 :WEASD:surface:
 :SNOD:surface:

parm/product/gefs.0p25.fFFF.paramlist.b.txt

@@ -151,7 +151,6 @@
 :O3MR:5 mb:
 :O3MR:70 mb:
 :O3MR:7 mb:
-:PEVPR:surface:
 :PLI:30-0 mb above ground:
 :PLPL:255-0 mb above ground:
 :POT:0.995 sigma level: