Implement the ADDLINE command
Implement the DELLINE command
Handle X:lines from remote servers
Why did I store the banmask in a variable and then not use it?
Propagate X:lines when added and removing them
Propagate X:lines on server burst
Improve X:line setting messages
Currently permanent X:lines show up as "to expire in 0 seconds", which looks
strange and might be confusing to some people. I improved the messages to
specifically state when a permanent X:line is being added.
Propagate shuns to remote servers, since they work like X:lines too
Propagate X:lines beyond the nearest servers