Logging strategy

[lfrancioli]

At the moment, we use a single logger and not much thought was put into a good logging strategy for our messages throughout the library. Reviewing and developing a more principled logging strategy would be a neat thing to do.

[nawatts]

The Python docs provide some guidance for this: https://docs.python.org/3/howto/logging.html#configuring-logging-for-a-library