Use sunlink flag to prevent users from removing critical directories in
/proj. Applied to top level only for now, since that was reasonably easy to do, since projects and group stuff is all done on ops already (where the chflags has to run). We could apply this to experiment and image directories too, but we all know the better approach is to stop mounting /proj on experimental nodes, right? Also a new script mkprojdirs to create/recreate missing project directories and do the chflags (calls over to ops and uses the existing proxy script).
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