[sugar] interoperating with non-Sugar Jabber clients

[Dafydd Harries]

It would be nice if the Chat activity could be used to converse with non-Sugar
Jabber clients. The presence service has some code to generate invitations
when somebody initiates a conversation, but Sugar doesn't do anything with
these invitations.

One open question is how to associate the invitation with the Chat activity.
Should the association be hardcoded? What should the shell do if Chat is not
installed?

-- 
Dafydd