Sensor test board Rev 1

[jkominek]

• [ ] Put all of the little 2 pin headers on a uniform 0.100" grid so that they can be held in place by a breadboard while soldering.
• [x] Consider uniform-izing the regulator part types.
• [ ] Consider having both a 2.0V regulator and a 2.0V precision reference and the ability to swap between them.
• [x] Indicate which spots need shunts on them, and which don't, for operation. Looks like one "voltage" measurement has to be shunted, and the other doesn't? Confused me and I made it.