This branch introduces a new sync method which should use less bandwidth and might...

This new method syncs whole networks as a bulk including all ircusers and channels.
The compression introduced in 0.3 should be more effective here. The sync dialog does not yet reflect
this change (users and channels are immediately and always at 100%).
Breaks protocol big time, which means, this needs client and core from this branch to make it work.
Feedback is welcome!