Make compiled driver/plugin tool testing portable

[qwofford]

GUFI is written in C. We should have a portable method to distribute gufi for testing. This could be a container, a spack package, or something else.

There is a larger question. When should we implement a Spack package.py for dsi? If we implement a spack package for both GUFI and DSI, then the world of python+compiled driver and plugin tools suddenly become much easier to coordinate.

Food for thought. Low priority.