add mounting holes, add fiducials

removed level-shifters, because test equipment is able to run signals directly at the required 1.2 V

SCH: selected footprints for components

GIT: Pulled new version of library (git submodule)

Select some of the footprints from the KiCad libraries

SCH: Removed current-sensing I2C op-amp

POT: Change potentiometers from I2C operated to manual ones.

INITIAL commit, the schematic almost done

LIB: Add mipe_kicad_lib as a GIT submodule