cdplay author:
        Robin Redeker <elmex@ta-sa.org>

--back and --next was added by:
        Werner Backes

the open() O_NONBLOCK bug was noticed by:
        Alan Stein <ajs@ajsoft.com>

getopt problem was noticed by:
        Dylan Shell <dshell@robotics.usc.edu>

typos and outdated addresses were found by:
        Hermann Huettler <huettler@mail.zserv.tuwien.ac.at>
