UI improvements

• Use smaller icons, likely the same size of applications icons. Display status in a non textual way. Do not display protocol inline, move it to the details dialog.
• Automatically sort people, perhaps by the amount of conversations you had with them. Still allow to override the order.
• Clicking on both the text and the icon open a chat. Hovering for a bit displays the details dialog. (same behavior as gmail).
• Cleanup the layout of the details dialog.

Empathy support

• Add a --server command line option to empathy to not display the buddy list on startup.
• Add a DBus service to empathy with methods to open chat windows and the configuration dialog.
• Make desktop-data-model monitor buddy info using libempathy.
• Switch the online desktop session to use empathy.
• Switch bigboard to use the empathy dbus service.

Open questions

• Should we keep support for pidgin?