- this implies that jobControl is a user-resource for OpenFOAM.
It was previously located under $WM_PROJECT_INST_DIR/jobControl,
but few users will have write access there.
- an unset FOAM_JOB_DIR variable is treated as "~/.OpenFOAM/jobControl",
which can partially reduce environment clutter.
- provide argList::noJobInfo() to conveniently suppress job-info on an
individual basis for short-running utilities (eg, foamListTimes) to
avoid unneeded clutter.
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