Further cleanups and bugfixes

Further cleanups and bugfixes

* Remove "TODO: reimplement" comment in chanserv.c, since all the
functions were already reimplemented.

* Make "/msg ChanServ huggle" work again.

* Fix error messages when bad target names given to say and emote.

* If we get a MODE change affecting a user who somehow quit already,
just ignore it.

* Add debugging checks for mod_chanmode argument counts.
git-archimport-id: srvx@srvx.net--2004-srvx/srvx--devo--1.3--patch-25