Move job dirs to [workDir]/jobs/[mqid]/
Move job dirs to [workDir]/jobs/[mqid]/

This declutters the top level of the working directory,
which is now being used for configuration files, too.

Change-Id: I9acb6d039f7c20832c6478fd1cf3caa3717cbb6d

OpenChemistry/molequeue,OpenChemistry/molequeue,OpenChemistry/molequeue