reversed previous change: 255 bytes of protected data IS the limit
of these radios, so only test to there. golay code can only handle
255 bytes of protected data, anyway.
show % of packet length zeroed out when reporting a verify error.
Evidence is pointing to golay coder only being able to recover
from 2 wrong bits, not 3 in every 12.
add thorough test of golay coder/decoder to confirm that it works
properly.h