Make Quassel less crashy (yeah, case sensitivity in channel names is baaaad)... make

Make Quassel less crashy (yeah, case sensitivity in channel names is baaaad)... make
autoconnect-to-core work correctly... fiddle around with our Settings implementation
to try to make it work with SXE-enabled Qtopia (nope, still doesn't work).. And stop
Quassel from crashing at disconnect-from-core due to the nickview not being updated.