setOutDir.RdSets the main output directory and nulls out the others
setOutDir(settings, outDir)A Settings object
The desired output directory
The original Settings object with updated output directories
Sets the main output directory (settings$outdir) to outDir,
and sets numerous others (settings$modeloutdir,
settings$host$rundir, settings$host$outdir,
settings$host$modeloutdir) to NULL so they will revert to defaults
when check.settings is run.