* Remove cycleiterators, going to be moved to new branch: consumersets * fetch now has new argument "enable_callbacks" which replaces     ``process_next``. * process_next now emits a deprecation warning telling you to use     ``self.fetch(enable_callbacks=True)`` instead.
* Remove cycleiterators, going to be moved to new branch: consumersets
* fetch now has new argument "enable_callbacks" which replaces
    ``process_next``.
* process_next now emits a deprecation warning telling you to use
    ``self.fetch(enable_callbacks=True)`` instead.

ask/carrot,ask/carrot