util.muc: Fixed duplicate parameter names in function room:set_subject

util.muc: Fixed incorrect parameters for a function call

mod_pep: Removed some YODO comments

mod_pep: Added handler for disco responses

mod_message: Advertise offline message support as per XEP-0160 (thanks nolan)

xmppclient_listener: Pass session close reason to destroy_session (to be used in unavailable presence)

mod_iq: Change sub-event names for IQ errors and results to use stanza IDs

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