Changed in 0.5.0
----------------

  No stunning news from a user point of view, but:

* pfqueue is now composed by three distinct parts:

  - backends, to interact with the MTA
  - libpfqueue, general pourpose library that makes use
    of backends to bring applications queue managing
    functionalities
  - a frontend, that uses libpfqueue to display informations
    (the one you start with 'pfqueue')

  This way, it will be much easier to develop other kind of
  frontends, being they user interfaces (KDE, Gnome et al)
  or other services (TCP-based server to be queried remotely).

* The above split involved a deep rewrite of most code, which 
  finally made it more readable, cleaner, and possibly more efficent.
  
* New 'auto-work-on-tagged' option, that make actions work
  automatically on tagged messages, if there are any; overrides
  work-on-tagged setting.
  
* The default autorefresh is now 1 second

* Tagging a message moves to the next

* In some circumnstances, it may happen that 'show message' did
  not show the one you choosed, basically because of the way the
  interface was handled; this is now fixed.

* DEL key can be used to delete a message, as well as ENTER to
  show message details; SPACE tags the message.

* better error reporting
