Version 0.89a
Merged in changes from dc42's firmware 0.78c
M302 requires "P" parameter to allow/deny cold extrudes, it will only report the status otherwise
Added "X" parameter to M558 to allow the usage of an X microswitch endstop when using IR probes
Replaced RRP's homing g files with dc42's files
Layer height is read from the end of gcode files if it is not found at the start
Other minor changes