First attempt at support for adding and removing users from nick lists during netsplits.
Fix duplicate initialization of userAwayBitmap in BufferFragment.java.
Make each Network observe its own statusBuffer.
This fixes the issue where new messages in a status buffer did not cause the network name in BufferFragment to change color as it should.
Merge branches 'duplicateuserawaybitmap', 'netsplit' and 'statusbuffercolorfix'