Currently, parsing JGroups network data via wireshark is difficult:

• message lists don't have (a) total number of bytes and (b) bytes/message and
• headers don't have (a) total bytes for all headers and (b) bytes / header

Investigate whether we can change the marshalling format to accommodate the wireshark plugin. This has the nice side effect that the JGroups wire format becomes standardized, ie. each header has the same format. This allows us to display a header even if we don't know how to parse it. In this case, we'd simply display the name and number of bytes.

Caveat: we want to avoid having to make messages bigger when marshalled.