This will remove all the print statements, and finally implement sane module wide logging.
It may or may not work with multiprocessing out of the box, but then again multiprocessing is not a first class feature for now.

The idea is to have a zmq based log handler implemented using the standard (much wow)
python logging module, where every qcodes module gets a logger (and so should every driver).

This way a QT and a web interface can easily be provided.

The issues to explore are mostly related to how much scientist will blindly log without realizing that it's not free, and won't ever be free but then again, given how much print statement there are already and how slow they are we should not see any big hit.