Added patch to bootloader for Mega2560. (Mark Sproul)
See #181 #392 #505 #543 #544
Saved old production firmware for Mega2560
Fixed compile problems with avr gcc 4.6.2 (crosspack CrossPack-AVR-20121207.dmg)
Mega2560 bootloader: fix wrong eeprom addressing
Mega2560 bootloader: use avr library functions for writing into EEPROM
Fixed permissions
Merge branch 'mega2560-bootloader' into HEAD