mod_pubsub_post: Allow specifying item id by a special mapping If `{http://jabber.org/protocol/pubsub}id` exists as an attribute at the top level then it is used, otherwise the previous behavior (.id if string)

-- this module is deprecated, log an error and load the superseding module instead
module:depends"smacks"

module:log("error", "mod_smacks_offline is deprecated! Just use mod_smacks!");