Current Issues:

  - fix up select by date apis

  - fix up "isAVersionableResource"

  - rethink branch structures

  - The UI (such as it is) for version controlled objects (a.k.a 
    the version control tab) is hacked in a most unsavory way. We 
    need to finish providing a ZMI UI for the basic VC operations 
    and integrate the version control tab in a better way.

  - The ZMI for the Repository, VersionHistory and Version objects is 
    only just started. We should at least have basic UI for these.

  - What happens if a repository goes away or if a version history 
    were to be deleted somehow is still not well thought out. At a 
    minimum, the UI elements should be able to tell if something 
    really bad has happened and tell you (right now you'd probably 
    get a traceback).

  - We'd like to support some way to set the default state policy 
    (checked out by default vs. checked-in by default). This is 
    something that we could add later.