Sugar demo 2

• Factor out the presence stuff to his own module
• Add support for multiple p2p groups (so that each activity can use his own group)
• Factor out the list of buddies from the chat and move it to the shell
• Make it contextual to the current activity/group
• Reuse the chat code (not the service) in the shell to show contextual chat
• Have a good look to diana mockups and to gtk theming stuff to figure out how to implement that
• Gradually move towards diana mockups, integrating icons, changing color themes, writing notebook widget ? etc

A more detailed SugarDemo2TODO