The patch has been applied to crew.

I attach a patch against crew. Directory renaming works fine. Link modifications 
also work. '--rev' options is supported.

I have made a few changes to support baz and tla, so I have also change the
converter name to GNU Arch. One can convert a repository created with baz via
tla and viceversa.

I've been working with a new baz (GNU arch) converter for the convert
extension. The converter is quite slow, as I didn't know how to
compute a changeset between patches easily. The log files might not
provide all the information needed (added, removed, modified files),
so I decided to use the 'delta' command which computes all this
information, and this takes a bit of time.

I still have problems when renaming directories. In the getchanges
function I create a copies dictionary like I do in files (e.g. {
'src/foo1': 'src/foo2' }). Is this the right way? Should I create
copies for all files in directory recursively? (this does not seem the
best way to do it).

I also sent this information to the devel mailing list:

http://www.selenic.com/pipermail/mercurial-devel/2008-January/004568.html