improved commentary.
fixed one bug with interleaved golay decoding buffer handling.
Enabled more debug output with AT&T=FEC (which required some
fiddling to prevent OSEG overflows).
Now can lock in non-interleaved mode with non-interleaving SiK
firmware, but is showing lots of CRC errors, when it probably
shouldn't (radios <1m apart @ +20dBm, margin about +75dB).