update doku
update eagle files
add DigitalInput addon board
update gitignore
Merge branch 'master' of github.com:icke2063/I2C_IO_BOARD

Conflicts:
	.gitignore
change mapping

- change virtual data length -> 8 byte (need for onewire romcode)
- change eeprom data start -> end of mapping
- change eeprom permanent data length -> 8 byte
- change function code position -> begin of eeprom
- change name position
add onewire support
update common_AVR