Add a setuid utility script that will chown a directory tree
(recursively) to the UID of the real user (not effective) user. The user must have write permission on the enclosing directory. Currently, this script is is called from the Archive code, when copying in files, to avoid permission errors when the current user is not the same as the previous user. This script can also be used from several other places that have exhibited similar directory permission problems.
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