Announcements ahoy

Partychat's convenient alias command lets you chat with an alias instead of your jabber id, but unfortunately does not obey the principle of least surprise. As a result our friend group has too many conversations of the following form:

["dolapo"] i think dan is the greatest.
["realdolapo"] dammit dan, change your alias.

Tired of being the brunt of these sorts of "jokes" I decided to modify partychat to publicly announce changes to chat room state. Now when Dan decides to change his alias, partychat will say xxxxx@gmail.com (dan) is now known as dolapo. This should reduce the amount of frustration in my life while hopefully forcing Dan to step it up in the humor department.