Spawning a process in IronPython

I've been using IronPython recently as a scripting language because its string handling and ability to provide structured programming support is so much richer — and accessibly documented — than old .BAT & .CMD file programming supports. The downside is that the old style files make launching sub-processes trivial. So, in the spirit of DRY (Don't Repeat Yourself), here's the file to import.

And yes, this is really another example of how to use .Net rather than how to use Python.