Merge pull request #626 from billsacks/histaux_atm2med_fixes

Fixes to some histaux atm2med xml values

### Description of changes

There are three separate but related changes here to the histaux atm2med files:

(1) Put Sa_co2prog and Sa_co2diag on a single file each: These two CO2 fields were both being output to both file4 (3-hourly) and file5 (daily). I'm keeping prognostic CO2 just on the 3-hourly file and diagnostic CO2 just on the daily file.

(2) Add Faxa_ndep to histaux_atm2med file 5 (daily) (see also ESCOMP/CTSM#1844)

(3) Change atm2med file5 to actually be daily rather than 3-hourly: My sense from the description and file name is that this file is intended to be daily but was accidentally set to 3-hourly. It was changed from daily to 3-hourly in #378 and that appears to have been a mistake.

### Specific notes

Contributors other than yourself, if any:

CMEPS Issues Fixed (include github issue #):
- Resolves #375

Are changes expected to change answers? (specify if bfb, different at roundoff, more substantial) No - bfb

Any User Interface Changes (namelist or namelist defaults changes)? Changes some defaults related to atm2med histaux files.

### Testing performed

No testing done yet!

Author: billsacks

cime_config/namelist_definition_drv.xml

@@ -1478,7 +1478,7 @@
       Auxiliary mediator a2x dynamic, radiation, and precipitation fields history output every 3 hours
     </desc>
     <values>
-      <value>Sa_z:Sa_topo:Sa_u:Sa_v:Sa_tbot:Sa_ptem:Sa_shum:Sa_dens:Sa_pbot:Sa_pslv:Faxa_lwdn:Faxa_rainc:Faxa_rainl:Faxa_snowc:Faxa_snowl:Faxa_swndr:Faxa_swvdr:Faxa_swndf:Faxa_swvdf:Sa_co2diag:Sa_co2prog</value>
+      <value>Sa_z:Sa_topo:Sa_u:Sa_v:Sa_tbot:Sa_ptem:Sa_shum:Sa_dens:Sa_pbot:Sa_pslv:Faxa_lwdn:Faxa_rainc:Faxa_rainl:Faxa_snowc:Faxa_snowl:Faxa_swndr:Faxa_swvdr:Faxa_swndf:Faxa_swvdf:Sa_co2prog</value>
     </values>
   </entry>
   <entry id="histaux_atm2med_file4_history_option">
@@ -1543,7 +1543,7 @@
     <group>MED_attributes</group>
     <desc>Auxiliary mediator a2x aerosol and ghg history output daily or endofrun</desc>
     <values>
-      <value>Faxa_bcph:Faxa_ocph:Faxa_dstwet:Faxa_dstdry:Sa_co2prog:Sa_co2diag</value>
+      <value>Faxa_bcph:Faxa_ocph:Faxa_dstwet:Faxa_dstdry:Faxa_ndep:Sa_co2diag</value>
     </values>
   </entry>
   <entry id="histaux_atm2med_file5_history_option">
@@ -1552,7 +1552,7 @@
     <group>MED_attributes</group>
     <desc>history option type</desc>
     <values>
-      <value>nhours</value>
+      <value>ndays</value>
     </values>
   </entry>
   <entry id="histaux_atm2med_file5_history_n">
@@ -1561,7 +1561,7 @@
     <group>MED_attributes</group>
     <desc>history option span</desc>
     <values>
-      <value>3</value>
+      <value>1</value>
     </values>
   </entry>
   <entry id="histaux_atm2med_file5_doavg">
@@ -1579,7 +1579,7 @@
     <group>MED_attributes</group>
     <desc>Number of time samples per file.</desc>
     <values>
-      <value>2</value>
+      <value>1</value>
     </values>
   </entry>
   <entry id="histaux_atm2med_file5_auxname">