Got rid of class Global, as promised. For now, the few global variables we still

Got rid of class Global, as promised. For now, the few global variables we still
have are in a new namespace Global. This is bound to change to Quassel:: or sumthing.

Oh yeah, and if you find out why QPainter complains, feel free to tell me or fix it.
Everything seems to work, but we still get spurious debug output.