Changelog Rev A2 -> Rev A3
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 + All components on top side. 
 + Fiducials for automatic component placing
 + Square pads on pin 1. 
 + Change 1K resistors to 4.7K
 + Move C17
 + Change C32, C33
 + U10 wrong footprint
 + R42-44 cluster, move further apart. 
 + Forgot a 22uF cap on the BOM
 + Added testpoints for 5V and 12V
 + Added a Dallas 1W temperature sensor port (18B20)
