Fixed race condition introduced in version 1.09f
If debug output isn't consumed by a USB host, discard it instead of
blocking( which eventually caused the software watchdog to time out).
Fixed print quality problems that mostly affected delta printers e.g. on
spiral vase cylinder
When reconnecting a browser, cancel any file upload from the same IP
address
M111 now prints the number of each module with debugging enabled or
disabled
In special moves on delta printers, the F parameter is now interpreted
as the speed of the tower that moves the most
M114 now reports stepper positions as well as head position
Default to output in Marlin mode
M104 command defaults to the only tool if there is only one tool and it
is not selected
Trying different code for M999PERASE command to see if we can get it to
unlock flash and reset more reliably
When step errors are logged, report them immediately if Move debugging
is enabled. Also reports the total number of step errors in M122.
Changed interrupt priority to make tick interrupt higher priority than
step interrupt, because we rely on the tick interrupt to check for over
temperature conditions and kick the watchdog
Fixed two potential divide by zero errors in PrintMonitor
Don't report an error if tpre, tpost or tfree macro file is not found
Changed the way we report bed height errors after bed probing without
calibration
Final Z probing speed is now always 1/3 of the initial probing speed as
set by M210
Bug fix: after Z probing the Z height was set incorrectly by 1 motor
microstep
