protect flush_figures post-exec function from user error...

protect flush_figures post-exec function from user error Invalid matplotlib data may raise inside print_figure. flush_figures() is a post-exec function, so user errors should not raise. Instead, call get_ipython().showtraceback() if called from IPython, raising as before otherwise.

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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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