Without headings, it's non-obvious which sections correspond to which
comparisons in the output file. This information was printed to
standard output, but not to the output file. So I added this
information to the output file as well.
My knowledge of Perl is limited so I just used system("/bin/echo ..");
for now. It would be good to fix that later.
I've added a copyright notice for myself, since this change is
probably significant enough to be copyrightable.
They have never been consistently kept in any revision control history, so
the revision control stuff I have before today is probably not all that
helpful either since it's so sporadic.
