Add a local Bitlbee account

This is useful for private/local chat networks, like stuff used at
work. We don't autojoin this network because we may not have a local
Bitlbee server on all of our computers.
Add niirc network

This is added as a local connection, because this IRC network isn't
available outside of NI. We don't autojoin by default because not all
of my computers will be accessing the inside of the NI network.
Enable UTF-8 in irssi