Improved default definitions file.
Improved default definitions file.

Added versioning.

As an example, the simple device described here:

https://lantz.readthedocs.org/en/0.3/tutorial/building.html

is implemented (except digital inputs and outputs)

MatthieuDartiailh/pyvisa-sim,famish99/pyvisa-sim,hgrecco/pyvisa-sim