Gocept.amqprun

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- Include <amqp:writefiles> into the transaction handling, i.e. write to file
only on commit. Previously, when an error occurred e.g. inside the
MessageStored event, duplicate files would be written (each time the message
was processed again on retry after the error).

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- Crash the process on filesystem errors for <amqp:readfiles>. Previously only
the file reading thread crashed, but the process kept running, unaware that
it now was not doing its job anymore, since the thread had died.

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- Support more than one Server in a single process.

- Introduce ``setup_handlers`` parameter for Server so clients can disable
setting up handlers.

- Fix a bug in the <amqp:readfiles> transaction implementation that caused
crash when aborting a transaction (12437).

- Allow test server to take longer time for startup on slow computers.

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- Refactor Session / DataManager responsibilities (9988).

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- Fix IDataManager implementation: abort() may be called multiple times,
regardless of transaction outcome. Only release the channel refcount once.

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- Improve logging of IDataManager.