Modification: Acknowledgment DGN

Martin Perlot submits the following proposal:

In the Acknowledgment DGN (Section 3.2.4.3),

Byte 4: Address Acknowledged. uint8 Source Address being acknowledged.
Byte 2, Bits 4-7, Reserved for Compatibility with SAE J1939
Byte 3, Reserved for Compatibility with SAE J1939

Justification:
SAE has recently modified their version of the same packet. They added the Address Acknowledge byte in the position indicated, and added a three-byte field using bytes 1-3 called "Extended Identifier". The latter is not relevant to RV-C and should not interfere with the RV-C use of these bytes for instance and bank. Implementing these changes shall make it easier for designers to make products compatible with both networks.