Cleanup: old/unused files
Sync with NetEEPROM_defs.h
Split Uno and Duemilanove entries for clarity
Changed default ISP to AVR ISP mkII. Commented out unfinished targets
Moved from optiboot's <boot.h> to <avr/boot.h> in preparation for more different boards. Removed optiboot's <boot.h>
Updated bootloader binaries to the latest changes