- Homing to bottom is accomplished by reducing current on Z motor and using stallguard
to detect when the Z axis bottoms out.
- This is a lot faster than homing to Z_MAX (yah!)
- Now supports EinsyRambo 0.3
- M119 now shows average stallguard values for previous planner motion.
- M914 now disables stealthchop to allow SGT to be hand-tuned.
- Now using SERIAL_ECHO rather than SERIAL_PROTOCOL.
- M914 now allows negative values without overflow.
Marcio Teixeira