stop channels in background threads...

stop channels in background threads stop_channels() *must* be called, to prevent fd count rising, but stop_channels waits up to 0.2s up to 4 times, and it shouldn't get in the way of the UI. This just calls stop_channels in a thread, to protect UI responsiveness.

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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

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