Move Gen6 stuff into a proper location.

ArduinoAddons/Arduino_0.xx/Gen6/boards.txt

...ons/Arduino_0.xx/Gen6/bootloaders/atmega644p/ATmegaBOOT.c

...uino_0.xx/Gen6/bootloaders/atmega644p/ATmegaBOOT_324P.hex

...duino_0.xx/Gen6/bootloaders/atmega644p/ATmegaBOOT_644.hex

...uino_0.xx/Gen6/bootloaders/atmega644p/ATmegaBOOT_644P.hex

...oAddons/Arduino_0.xx/Gen6/bootloaders/atmega644p/Makefile

...ddons/Arduino_0.xx/Gen6/bootloaders/atmega644p/README.txt

ArduinoAddons/Arduino_0.xx/Gen6/cores/arduino/Arduino.h

...Addons/Arduino_0.xx/Gen6/cores/arduino/HardwareSerial.cpp

...noAddons/Arduino_0.xx/Gen6/cores/arduino/HardwareSerial.h

ArduinoAddons/Arduino_0.xx/Gen6/cores/arduino/Print.cpp

ArduinoAddons/Arduino_0.xx/Gen6/cores/arduino/Print.h

ArduinoAddons/Arduino_0.xx/Gen6/cores/arduino/Stream.h

ArduinoAddons/Arduino_0.xx/Gen6/cores/arduino/Tone.cpp

ArduinoAddons/Arduino_0.xx/Gen6/cores/arduino/WCharacter.h

ArduinoAddons/Arduino_0.xx/Gen6/cores/arduino/WConstants.h

ArduinoAddons/Arduino_0.xx/Gen6/cores/arduino/WInterrupts.c

ArduinoAddons/Arduino_0.xx/Gen6/cores/arduino/WMath.cpp

ArduinoAddons/Arduino_0.xx/Gen6/cores/arduino/WProgram.h

ArduinoAddons/Arduino_0.xx/Gen6/cores/arduino/WString.cpp