Updated to: 3.1.0-RC1
Some of the format changes introduced were done to improve readabilty and
remove compiler warnings about needing parenthesis
Some code restructuring has been done to eliminate unused code and variables
Cleanup defined but unused functions
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.