[PATCH] Make it possible to retract PEP items
This patch adds support for retracting items from a PubSub node. In detail it adds:
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The function send_pb_retract to that which sends a stanza to remove items from a pubsub node
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The functions user_retract_[mood|tune|activity] to pep.py which allow to retract the specified for a certain account
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Code in dialogs.py to use the aforementioned functions