Modifies schematics for scenario with single MN relays and analog multiplexers...

Modifies schematics for scenario with single MN relays and analog multiplexers for roles M1 M2 and N. This assumes that the measurement board is modified to allow simultaneous measurements of M1 and M2 on the ADS, while N is put on the GND. The multiplexers would allow to cycle between a series of M1 and M2. See issue #60.