mod_pubsub_subscription: New module providing an API for pubsub subscriptions This lets other modules hook events from local or remote XEP-0060 pubsub services. API allows keeping track of items added, removed or if the whole node gets cleared or even deleted. Requested by MattJ.

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summary: Allow server administrators to probe any user
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This module lets server administrators send `<presence type="probe"/>`
to any local user and receive their presence in response, bypassing
roster checks.