Builds necessary back-channel for https://github.com/pyr0ball/pyr0piezo/issues/2 Also added pin assignments used in https://github.com/pyr0ball/pyr0piezo/issues/18
Still ToDo: route traces for PT100 input to amp
This is a first draft of the new rewiring scheme Moving from 1mm pitch 26pin to 0.5mm pitch 60pin for greater number of signals. Should allow for the new planned features.
