plugin XEP-0166, XEP-0234, XEP-0261: - transport and application data are now managed in separate dictionaries - new client.IQ method is used - new buildAction helper method for applications and transports - "role" is now stored in session_data - "senders" is now stored in content_data - plugin XEP-0166: "transport-info" action is now managed - plugin XEP-0166: application namespace and handler are now managed in a namedtuple - plugin XEP-0234: <range/> element is added by responder if not already present