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.
Removed the non-working pressure advance feature.
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.
1) Fix of stepper control timing
2) Load / restore baby stepping after 9 point bed leveling using
the planner instead of the questionable baby stepping routine.
Improvement of the menu system: Use a shared menuData union to preserve
memory. Adaptation of baby stepping and edit menus to menuData.
Improvement of the "Toshiba FlashAir" status display. Don't force IP
address query on each display refresh when in the "Support" menu.
Bugfix of the baby stepping menu: Show the correct value instead
of zero when the baby stepping menu is entered.
New feature: Bed leveling adjustment at left / right / front / rear side.
The bed adjustment feature is accessible from the Settings menu
and as L R F B codes of the G80 code.
Implemented bed skew calibration by matching a precise physical model
to the measured data using the least squares method.
Rewrote handling of the command buffer to preserve memory
and allow pushing the commands to the front of the queue.
