Added modified Sanguino files

Marlin/Sanguino/boards.txt

Marlin/Sanguino/bootloaders/atmega644p/ATmegaBOOT.c

Marlin/Sanguino/bootloaders/atmega644p/ATmegaBOOT_324P.hex

Marlin/Sanguino/bootloaders/atmega644p/ATmegaBOOT_644.hex

Marlin/Sanguino/bootloaders/atmega644p/ATmegaBOOT_644P.hex

Marlin/Sanguino/bootloaders/atmega644p/Makefile

Marlin/Sanguino/bootloaders/atmega644p/README.txt

Marlin/Sanguino/cores/Copy of arduino/HardwareSerial.cpp

Marlin/Sanguino/cores/Copy of arduino/HardwareSerial.h

Marlin/Sanguino/cores/Copy of arduino/Print.cpp

Marlin/Sanguino/cores/Copy of arduino/Print.h

Marlin/Sanguino/cores/Copy of arduino/Tone.cpp

Marlin/Sanguino/cores/Copy of arduino/WCharacter.h

Marlin/Sanguino/cores/Copy of arduino/WConstants.h

Marlin/Sanguino/cores/Copy of arduino/WInterrupts.c

Marlin/Sanguino/cores/Copy of arduino/WMath.cpp

Marlin/Sanguino/cores/Copy of arduino/WProgram.h

Marlin/Sanguino/cores/Copy of arduino/WString.cpp

Marlin/Sanguino/cores/Copy of arduino/WString.h

Marlin/Sanguino/cores/Copy of arduino/binary.h