user or group Ids as well as user or group names.
In particular, this fixes freesbie2, which uses
-R 0:0 to copy a bunch of files so that the result
will be owned by root.
Also fixes a related bug that mixed-up the uid
and gid specified by -R when in passthrough mode.
Thanks to Dominique Goncalves for reporting this
regression.
Approved by: re (kib)
49230574bc