request vcard to real jid if we know it. see #3054. TODO: request last time and os information to real jid too

http://www.xmpp.org/extensions/xep-0045.html#registrar-statuscodes-init

http://www.xmpp.org/extensions/xep-0045.html#roomconfig-notify

 * Handle Multiple status code in MUC.
 * Warn the user if room logging is enabled (
http://www.xmpp.org/extensions/xep-0045.html#enter-logging ). Fix #3270.

 * cleanup and bugfix for sensitive color table

states. Fix #2755.

So all the messages are grayed.

compute metacontact big brother by comparing them instead of computing an absolute score for each one. fixes #2781 and #2156