Fix some bugs, add a '+short' command.
Added plugins: Encoder, Joke, Karma. Moves s/// into Regexp.

* Add support for disabling of certain types of s/// (eg: +regexp
disable / or +regexp enable /)
* Add support for directing output at people/channels: +help
@@<person/channel>
* Add support for kicking, oping and deoping
* Add support for evaluating perl code (owner-only)
* Add support for loading/unloading modules on the fly
* Add ctcp_* events