simplify specification of stop_option, rest_option and history_option (cesm only) #313
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Description of changes
simplify specification of stop_option, rest_option and hist_option
Specific notes
This PR addresses issue #311
Only the following values are now allowed
none,never,nsteps,nseconds,nminutes,nhours,ndays,nmonths,nyears,date,end
Contributors other than yourself, if any: None
CMEPS Issues Fixed: #311
Are changes expected to change answers? bfb
Any User Interface Changes (namelist or namelist defaults changes)? None
Testing performed
Verified that SMS_Ln9.f19_g17.A.cheyenne_intel if HIST_OPTION is 'nstep', preview_namelist_fails
Hashes used for testing: