add IPv6 equivalent for mac2ip to get the ip of a node given only by mac (batman announces gateway by mac only)
add IPv6 equivalent for mac2ip to get the ip of a node given only by mac (batman announces gateway by mac only)

ffff-next/ffff-next,ffff-next/ffff-next,meskal/ffff-next,RedDog99/bielefeld,meskal/ffff-next,ffff-next/ffff-next,meskal/ffff-next,RedDog99/bielefeld,RedDog99/bielefeld,ffff-next/ffff-next