This is an implementation of a fast and smart algorithm for threading
mail messages, as described by Jamie Zawinski at
http://www.jwz.org/doc/threading.html.  Don't send problems with this
code to him, though; instead contact the author at amk@amk.ca.

This code is under a BSD-style license; see the LICENSE file for the
full text.

The master repository is available at
<http://bitbucket.org/akuchling/jwzthreading>.

--amk