* +a (away) user mode
          This user mode is used to propagate users' away status between
	  servers.

	* added channel mode +e (exceptions to bans).
	* added channel mode +I (invitations).
	* invites can now be used to override channel bans and limit.
	* banned users cannot speak on channel without +o/+v.
	* ! channels introduced (can't be collided);
	  A quite detailed technical description can be found on the web:
		http://www.stealth.net/~kalt/irc/channel.html

	* NJOIN for 2.10 <-> 2.10 communication on connect bursts instead of
	  the combined JOIN/MODE introduced by 2.9 (and now deprecated)

	* a slave process is now used to authenticate incoming connections.
	  The slave's modular design makes it easy to add new authentication
	  modules.