This documentation has been written and is copyrighted 1997 by Markus Gutschke <gutschk@math.uni-muenster.de>. You are free to distribute this file as long as you do not change its contents. I appreciate comments and will consider them in future revisions. If you have any questions, comments, or suggestions, please also send carbon copies of your e-mail message to both Ken Yap <ken.yap@acm.org> and Gero Kuhlmann <gero@gkminix.han.de>. I will happily include any of your extensions, but I would like to avoid the proliferation of different incompatible revisions of this document. If these conditions are a problem to you, then feel free to contact me.