Updated communication protocol.
Updated communication protocol.

Updated CAN bus protocol with new header formatting the message content
(review as new).  Also updated Ethernet IMU Data message to include a
sync time for each data packet from the IMU – i.e. IMU data and attitude
data.

SenteraLLC/pic32-fmu.X,UASLab/pic32-fmu.X,UASLab/pic32-fmu.X,UASLab/pic32-fmu.X,SenteraLLC/pic32-fmu.X,SenteraLLC/pic32-fmu.X,UASLab/pic32-fmu.X,SenteraLLC/pic32-fmu.X,UASLab/pic32-fmu.X,SenteraLLC/pic32-fmu.X