added fuse and zener on isolated side
added power indicator LED to isolated 3.3V
added reset button

A capacitor is not strictly required, but the data sheet
recommends a 10nF capacitor in harsh environments.

We chose a 100nF capacitor to keep the parts list and
assembly instructions simple.
added JTAG
added serial header for programming port
added serial header for JY-MCU HC-06 bluetooth module
replace serial port net-labels with plain text
connect ADS129x to SAM3X
connect ADS129x CLK to SAM3X PA2

 PA2 is labeled AD7 in the Arduino Due schematic