gcode files, scripts to generate them and auxiliary output files
Updated schematic.
- Added ground and Vcc pours.
- shifted some lines around to allow for larger pours for GND and VCC
- 'Use auxiliary axis as origin' for ploted gerber files.  If we don't
  do this, the gerber files generated put the front, back and drill
  co-ordinates in different quadrents
- don't mirror y-axis for drill file