Code review comment for lp:~mwhudson/launchpad/bzr-2.1b4-upgrade

Hi,

This branch updates us to bzr 2.1b4. This could have been a one character change in versions.cfg, but I accidentally ended up removing a bunch of cruft we had that was only there to support old versions of bzr. The one of these that has the largest (textual) impact is removing lp.codehosting.bzrutils.ensure_base, all the others are pretty trivial I think.

Cheers,
mwh