Added src and dst to BACnet MS/TP WTAP dissector. Added BACnet MS/TP summary
with src, dst, and frame type to tree. Removed src and dst in column info text
since this was duplicated. Changed field names for src, dst, hdr, and len to
be more consistent with other protocols.
svn path=/trunk/; revision=25323
Added MS/TP decoding for the WTAP BACnet MS/TP datalink, and added decoding for
BACnet MS/TP datalink from a Cimetrics U+4 which spews SNAP protocol packets.
svn path=/trunk/; revision=25291