prevent profile_dir from being undefined...

prevent profile_dir from being undefined can happen when other traits are configured that depend on profile_dir, e.g. `NotebookApp.extra_static_paths`. This ensures that `init_profile_dir` fires prior to any reference to the profile directory.

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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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