Update tracer

Remove cruft that didn't pan out
comments.tmpl logic now works

Still needed:

* CSS to make output pretty
* Better handling of comments
  Use @POST_ID@ and derived commentID to dynamically create reply-to
  subject line
Update comments.tmpl further

Comment files now need to contain:

\t\t<p class="displayName">Some name</p>
\t</div><!-- .commentHeader -->
\t<div class="commentBody">
Some text here...
\t</div><!-- .commentBody -->

NOTE: WPP sprouts a WARNING about how nothing works when there are
nested comments. But at the same time it seems to build the comments
exactly as I intend in my tests, so while it is ugly, it still works.

Will try to go to the bottom of this WARNING later