* @param user The user to join to the channel
* @param privs Priviliges (prefix mode letters) to give to this user, may be NULL
* @param bursting True if this join is the result of a netburst (passed to modules in the OnUserJoin hook)
* @param user The user to join to the channel
* @param privs Priviliges (prefix mode letters) to give to this user, may be NULL
* @param bursting True if this join is the result of a netburst (passed to modules in the OnUserJoin hook)