Introduce logging

[fijam]

Some of the messages printed are too verbose. Move some of them to a logging facility, and expose an argument to display them (or save to a log file).

Initial work in 5e36034

[fijam]

finishing this will require a bit of a refactor

[fijam]

There is a bit of a chicken-egg problem... we are loading hardware before main() to avoid #4 and hardware imports logging, so we would need to do logging.basicConfig before that - which works, but isn't pretty.