Where to get a BZR tree of the latest MySQL releases

I just posted this to the MySQL Internals mailing list:

Hi all,

Like many of you, I’m disappointed that the bzr trees for MySQL are out
of sync with the tarball source and binary releases from Oracle.

Since Oracle has been silent on this, and this is a recurring problem,
I’ve decided to attempt to help the situation.

I’ve created the following bzr trees:
lp:percona-server/upstream-5.0
lp:percona-server/upstream-5.1
lp:percona-server/upstream-5.5
lp:percona-server/upstream-5.6