This code is copywrited, 1996--99 by Moshe Elitzur, and may not be copied
without acknowledging its origin. Use of this code is not restricted, provided
that acknowledgement is made in each publication.  The bibliographic reference
to this version of Dusty is Ivezic, Z., Nenkova, M. & Elitzur, M., 1999,
User Manual for Dusty, University of Kentucky Internal Report, accessible at 
{http://www.pa.uky.edu/~moshe/dusty}.