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inputhookqt4: polish the qt4 related hooks...
inputhookqt4: polish the qt4 related hooks - make sure we don't install more than one 'pre_prompt_hook' for a given ipapi instance - clarify the internal documentation and move it from comments into docstrings

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logtopics.rst
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MinRK
zmq kernels now started via newapp
r3970 =======================
Log Topic Specification
=======================
we use pyzmq to broadcast log events over a PUB socket. Engines, Controllers, etc. can all
broadcast. SUB sockets can be used to view the logs, and ZMQ topics are used to help
select out what to follow.
the PUBHandler object that emits the logs can ascribe topics to log messages. The order is:
<root_topic>.<loglevel>.<subtopic>[.<etc>]
root_topic is specified as an attribute