packetbuf: added function "packetbuf_holds_broadcast()" for checking whether the current packet is a
broadcast
packetbuf: use packetbuf_holds_broadcast() all-over
framer-802154: create without frame802154.c
framer-802154: parse without frame802154.c
node-id: Functions for extra configuration data
llsec: Allow for sharing PRNG
llsec: Compromise-resilient 802.15.4 security