Improve Private Storage detection. MCabber now correctly detects Private Storage support when receiving an item-not-found error (which doesn't mean the server has no support for P.S., but that it's empty). I've added a return value to the callback functions. For now the return value is only used for IQ error handling.

 /RAWXML send string

Send "string" (raw XML format) to the Jabber server.
No check is done on the string provided.

BEWARE!
Use this only if you know what you are doing, or you could terminate the connection.

Example: "/rawxml send <presence><show>away</show></presence>"