Let's switch to Bazaar!

We need to meet all of the WorkflowRequirements.

Here's what we need to do:

• Install trac-bzr plugin
  • Upgrade trac to the latest version (or trunk?)
    • Upgrade all the templates to the new format
• Replace the post-commit hooks
  • mailer
  • buildbot
  • IRC bot
  • trac integration -- we might not need this
• Update release scripts
• Update developer documentation
• Change the revision-number-in-version code to handle svn
  • .bzr/branch/last-revision
• Make a decision about what to do with Combinator
  • Ignore Combinator
  • Give it a Bazaar backend, making it just a path-mgmt system