This Update is like 90% bugfixes.

 - IMPORTANT! - this version uses a new version of the SqlLite Schema (though only slitely different). The change to the schema _canno_ be done via an ALTER statement. Thus it is recommanded that you delete the current
quassel-storage.sqlite DB-File, so it gets created again.
 - SignalProxy got a new method which is basically just for debuging/info purposes. use SignalProxy::dumpProxyStat() to see some infos of the current proxy situation on STDERR.
 - fixed a bug causing Segfaults
 - fixed a minor bug where Quassel treated channelnames not casesensitive and thus created a second buffer for them