P4AC 4 axis controller

This is a drop in replacement for all of the stepper controllers for reprap/makerbot. It uses four Pololu 1201 stepper control modules so you can select your microstepping level from full step thorugh 1/16 step for each axis. It uses a 40-pin connector on the stepper board and 10-pin IDCs on the other end so it will work with gen3 motherboards. 6-pin IDC connectors are an option to use it with Gen4 motherboards in the future. Endstops are supported with CDROM style connectors for all four axi