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To generate CAM hourly forcing data for datm6 or datm7:
 
   - add to /Buildnml_Prestage/atm.buildnml_prestage.csh
 
     ndens       = 2, 2
     nhtfrq      = 0,-1
     mfilt       = 1,24
     fincl2 = 'ZBOT','UBOT','VBOT','TBOT','TS','PSL','QBOT','FSDS',
              'FSNS','ICEFRAC','PRECSC','PRECSL','SOLL','SOLS','SOLLD',
              'SOLSD','PRECC','PRECL','SRFRAD','PS'
 
   - the final atm.stdin should look like
 
     /fs/cgd/csm/inputdata/lnd/clm2/CAMDATA/ccsm3_bgc4_F_2.atm.stdin
 
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