CESM1.1.z - When running multiple instances, not all namelist files get copied to $CASEROOT/CaseDocs/.

[aliceb]

Affected Releases - CESM1.1.zFixed in CESM1.2.zWhen running multiple instances, not all namelist files get copied to $CASEROOT/CaseDocs/. To fix this problem, copy this version of preview_namelists into $CASEROOT