Removed redunant #define TEMP_INTERVAL (Now HEAT_SAMPLE_TIME)
Upgraded the sys folder files.
Version 0.74

All axis movements are now fully multi-dimensional without special branches
for just XY moves etc.  All maximum and minimum velocities and accelerations
are set by clipping a unit-length movement vector to the hyperbox of the
values.

Multiple identical G Code list values (e.g. G1 X98.436 Y104.621 E0.09393:0.09393)
can now be set with the first entry: G1 X98.436 Y104.621 E0.09393

Experimental, but tested...