Support repository renaming.

This allows us to svn mv the cauldron/PKG/current folder to a new name and
have this copied over to git.

It does not yet handle the case where subsequent commits to previous distros
for the old name are magically moved over to the new name for the repo
(which I think is the correct behaviour as noted on the sysadm mailing list)
so some kind of rename mapping will have to be kept (if I ever implement
resuming support, then this map will have to be dumped to a file and restored
again about restart)

Another problem is that the tags are apparently all squashed up due to the
svn mv commit, but this should be handled via a simple return... after dealing
with the repo rename (although some changes may get lost :( if this is not a
straight copy (i.e. svn cp + changes in the same txn)

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