Auto_Bed_Leveling: Enhanced G29 command

[AbuMaia]

Here you go. I have safe homing turned off. Maybe part of it is still active? Edit: I connected to Pronterface, homed all axes and watched as the Y axis moves while Z axis lifts before extending the probe. Once homing had completed, I manually moved the Y axis (via Pronterface) to see just how far it had moved. Since the Y move during Z lift didn't change the Y axis position (it was still considered at "home", position 0), the Y endstop switch didn't register when in negative coordinates, so I counted until I heard the click. It was 10mm. Interestingly enough, the RRD SmartController LCD doesn't do negative numbers, it went through symbols instead.