DUID class clean-up, some unit-tests written.
DUID uses vector<uint8t_>, hex.{cpp|h} added.
Version bumped to 0.8.3-git
hexToText is now used in several places.
readUint8, writeUint8, writeData implemented.
AUTH_REPLAY_* now have values assigned.
TMsg::{get,set}ReplayDetection() removed
One large auth code update.