Sugar demo 2

Highlevel goals

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
Figure out how to slide in chat/presence windows
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

Notes on the redesign/refactor of the presence service.

~~DBUS objects refactoring -- Dan~~
~~Separate chat from p2p by creating a presence service -- Dan~~
~~Modularize browser -- Marco~~
~~Modularize chat -- Marco~~
~~Cleanup activities interface (so we can write cool examples) -- Dan~~
~~Make it easier for an activity to send his output to the console, one call should be enough -- Marco~~

~~Only try to get Buddy Icons twice -- Dan~~
~~Make browser follow mode more solid -- Marco~~
Cursors not fully working on the olpc -- Marco
Add librsvg to the images -- Marco
Fix issues when trying to share an already shared page -- Marco
Chat should not fail if there is no network -- Dan
Fix the races with tab focus (See the checks has_activity checks. These avoid lockups but still they make focus state inconsistent) -- Marco
~~Ensure pylint doesnt show errors -- Marco~~
Assertion when clicking send on a just opened sugar with no text
~~Share button broken, probably by chat refactoring~~

~~Add drawing to one-to-one, probably same layout without the buddy list (what we can put in that area?)~~
~~UI love for the console -- Marco~~
Chat drawing area is bigger then what can fit inside the chat view with the current layout (probably put the nick under the icon and show that in the drawing area too)
~~Send button should also send text~~
~~Move to clearlooks on the olpc until we have our own theme -- Marco~~