Gocept-amqprun

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- Fix error reporting in ``.testing.QueueLayer.rabbitmqctl()``.

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- Moved code to and bug tracker to Bitbucket_.

.. _Bitbucket : https://bitbucket.org/gocept/gocept.amqprun

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- Pretend to support savepoints so we can work together with other systems that
support (and require) them.

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- Introduce ``gocept.amqprun.handler.ErrorHandlingHandler`` base class.

- Run integration tests (MainTestCase) in a separate ZCA, isolated from any
registrations that might have been done by other tests.

- Create temporary virtualhost on the rabbitmq server per test run.

- Improved test-case method ``send_message`` to take headers as a parameter.

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- Introduce ``IResponse`` for transaction-integrated exception handling.

- Fix timing bug: when the remote side closes the socket and at the same time a
channel switch is triggered, this used to break down (since the socket is
closed). We now ignore the channel switch attempt and simply wait for the
reconnect, which opens a new channel anyway.

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- Add ``xfilename`` variable to the ``<amqp:writefiles pattern="">`` setting.