Most framed mail viewing software has message ancestry
information near the top instead of bottom (mutt, gmane,
sylpheed, thunderbird) as it can help improve context.
Traditional netiquette also favors writing replies below
quoted (older) text for this reason; so move the thread
summary to the top of the message for context.
Since threads may be long, add a "skip" anchor link to jump to
the message body quickly, and align the date to the left column
so it's easier to tell the relative age of messages.
While we're at it, remove quotes from "id" attributes to
improve ease-of-grep-ability.