A first run at the board schematic.  The wiring needs checking.
 - Moved CSN to a less useful pin
 - Added points to connect the LEDs to OC1, for the ATmega8
Don't track board.bak
Replaced the 3 LEDs with a single 3-colour one
Moved the CSN pin on the receiver to match the PCB change in c310a57
Replace the ATmega8 test points with solder pads
Add debug port
 - Added no-connection labels to the AVR
 - The AVR's bypass capacitor wasn't connected
 - Added MCU control of the "enable" line
 - Corrected the XR1151 voltage adjustment resistors (maybe)