Copyright (c) 1993 - 2003 Regents of the University of California<p>
Author:     Douglas Scott<p>
Permission to use, copy and modify this software and its documentation
for research and/or educational purposes and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation. The author reserves the right to distribute this
software and its documentation.  The University of California and the author
make no representations about the suitability of this software for any 
purpose, and in no event shall University of California be liable for any
damage, loss of data, or profits resulting from its use.
It is provided "as is" without express or implied warranty.