[JDEV] Message timestamping and route tracking

[Steven Wagner]

> > If you add a timezone, you force every application which wants to use
> > the timestamps to do a timezone conversion.
>
> I disagree.  Send the timestamp as GMT, but include a timezone so that
> clients have the ability to display in recipient local time, GMT, or sender
> local time.

Users timezone info is helpful to the receiver... but lets make sure we don't
intertwine user info and msg transport info together in a single tag.