Improved accuracy of diagonal moves by oversampling the path discretization.
Accelerated the planner by rewriting time critical routines from floating
point to fixed point arithmetics.
Disable timeouts in the XYZ/Z calibration.
Don't modify feed rate multiplier during the XYZ/Z calibration.
Support multi screen messages in the XYZ/Z calibration - "move the Z carriages up" step.
Support up to three lines in the XYZ/Z calibration messages.
Added a new message "Measuring reference height of calibration point xx of 9".
Changed the "move the Z carriages up" message to suggest rotating the knob.
Changed the "live adjust not set" message to reference the manual chapter and section.
Remove debugging serial line output on Z calibration.
