Known contributors are listed here, in alphabetical order by their
abbreviations (which are used in Changelog).

 CH1 Christoph Hebeisen
 GT1 Geoff The <geoff at thistlewood.com>
 JR1 Jordan Ritter <jpr5 at darkridge.com>
 KS1 Kevin Sullivan <nite at gis.net> (original author)
 NBL nuf si <gnippiks at yahoo.com>
 PS1 Peter Selinger <selinger at theory.stanford.edu> (maintainer)
 VA1 Ville Aikas
