Pan Update

Well, I've finally started working on the UI. Naturally I had to start with what is probably the hardest part of the code, namely the article list. Here is a snapshot.

• Added some missing stuff to article.
• Added some code to try and prevent UI freezes during long ops. Such as loading overviews from the DB.
• Some minor changes to the article & group APIs.
• Updated articlelist.
• Updated header-pane-renderer.
• Fixed test-suite.

Here is my current TODO list in no particular order:

• remove message-identifier
• minor change to acache
• update flagset
• update scoring
• update filters

Those are just the things I'm certain of.

rev. 135