- Added state.sentREJ and state.sentSREJ properties
- Set REJ condition if a REJ frame has been sent
- Do not send REJ if one has already been sent
- Clear REJ condition if properly sequenced frame is received
- Added state.receiveBuffer for queueing out-of-sequence received I frames in preparation for SREJ support
- Increment state.receiveSequence on receipt of I frames based on current modulus (was mod 8)