Prevent setting of absurdly high hot end temperatures
Added R parameter to G1 to go back to previous location, with optional
offsets
Allow Pronterface and PanelDue M105 requests to execute during file
macros etc.
Added more status information for PanelDue to M105 S2 command
Send replies when prints are paused, resumed or cancelled
Added missing newlines at end of M105 responses
Increased X and Y course homing speeds
Added almost instant pause functonality
Support pause and resume macros
Support nested macros
Support zpl's web interface
Merge in zpl's web interface and network changes
Add R parameter to M105 command for PanelDue
M98 can now run macros from any SD card folder