python-pyusb: new package

PyUSB is a Python module that wraps libusb 1.0. (It can wrap other USB
libraries too, but I've hardcoded it for libusb as it seems the most
appropriate.)
python-usbtmc: new package

This Python package supports the USBTMC instrument control protocol for
controlling instruments over USB.

http://alexforencich.com/wiki/en/python-usbtmc/start