Get Quad extruders for Replicape by adding Reach

I've finally gotten around to testing the Reach A0 add-on board for Replicape A4A. This is a board that adds three more extruders to the two extruders that come with Replicape, for a total of five extruders. Any axis can also be configured in slave mode, in case you have multiple steppers pr. axis. The

Reach expansion board for Replicape ready for review

I have gotten a few requests for an expansion board to accompany the Replicape lately, so I have made an inital version for anyone interested in adding more extruders than the standard two present on Replicape. The Reach board uses the spare PWM and ADC pins from Replicape to keep the cost down and the