apkes: Avoid nonce reuse in HELLOACKs, send authenticated short address
in ACKs
node-id: Function for appending extra config data
apkes: Fully pairwise keys scheme
apkes: Removed start delay
apkes: Schedule erasure of master key within leap.c (better cohesion)
apkes: Trickle-inspired broadcasting of HELLOs and some simplifications