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

 PS1 Peter Selinger <selinger at users.sourceforge.net> (author)
 JR1 Joshua Redstone <redstone at cs.washington.edu>

Translators:

 PS1 Peter Selinger <selinger at users.sourceforge.net> (de, fr)
 BV1 Benoît Valiron <benoit at monoidal.net> (fr)
 EST Estprog <estprog@hot.ee> (et)
