Collaboration between kids on different XMPP servers

[marco]

Making it a blocker since #3340 depends on it.

When I try to invite the activity icon appear in inviter mesh view. Nothing happens in the invited view or frame.

I'm going to attach logs.

[marco]

Logs with the fix for 3370 on the inviter

[smcv]

This appears to be because Marco's XO and jhbuild were using different servers, so Salut was the only connection they had in common (we don't support cross-server collaboration for Trial-3 or FRS), but PS exports activities on the server if it can.

[smcv]

This is an unsupported feature at this stage, and will require considerable PS, Gabble and ejabberd work. It may be wise to do this as part of an "XMPP collaboration 2.0" effort that includes Rainbow integration.

[smcv]

Reassigning to daf, Cc the Collabora OLPC team, since I'm not currently working on OLPC.