Handler for Python logging module that emits to LSST logging.
Parameters
----------
level : `int`
Level at which to set the this handler.
Notes
-----
If this handler is enabled and `lsst.log` has been configured to use
Python `logging`, the handler will do nothing itself if any other
handler has been registered with the Python logger. If it does not
think that anything else is handling the message it will attempt to
send the message via a default `~logging.StreamHandler`. The safest
approach is to configure the logger with an additional handler
(possibly the ROOT logger) if `lsst.log` is to be configured to use
Python logging.