Update babystepsTodo atomically (disable / enable interrupts).
Disable debugging outputs on the serial line from the X/Y calibration code.
OctoPrint fix - fixes a hangup after G28: Link the G28->G80 G codes
by calling the G80 code directly without pushing it into the command buffer.
SD card driver patch to support the Toshiba FlashAir SD/WiFi card.
"M115 Umajor.minor.revision-flavor" will trigger a dialog
on the display if the "upgrade" firmware version number is higher
than the current version number.
at the end of the menu only.
Provided a general method for a menu function to detect exiting by a timeout.
When exiting, the menu function is called with a global variable menuExiting set.
Some errorneously removed functions were reverted.
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.
