* Burst with the default modes as well as the forcemodes (unless some of
the default modes are denied, of course).
* If there's only one user on the channel and they are known, don't burst
with +i or +k - this avoids kicking the users off their own channels.
Obviously if the user isn't known they shouldn't be joining so we leave
the modes set to get rid of them
* Ripped out the #ifdef 0'd code that used to try and deal with imposters -
there is no need for this now that we can burst into channels.