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Move displayhook for ZMQ shell to zmq.displayhook, and rename to make the difference clearer.
Straightforward tidying up. Because I went looking for the displayhook used by ZMQInteractiveShell, and spent a while changing the wrong one before I worked out that it was in zmqshell.py. This puts them both in zmq.displayhook, and attempts to clarify the difference.
See #512