mod_cloud_notify: added code to respond to the new event "smacks-ack-delayed" issued by mod_smacks when acks are delayed for a certain amount of time. This allows to send out notification requests before the read timeout or connection close event really happens, thus allowing conversations to be smoother.

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summary: Keep track of joined chat rooms
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This module attempts to keep track of what MUC chat rooms users have
joined. It's not very useful on its own, but can be used by other
modules to influence decisions.