Added missing COPYRIGHT statement

COPYRIGHT

+
+				  COPYRIGHT
+
+The following is a notice of limited availability of the code, and disclaimer
+which must be included in the prologue of the code and in all source listings
+of the code.
+
+Copyright Notice
+ + 2002 University of Chicago
+
+Permission is hereby granted to use, reproduce, prepare derivative works, and
+to redistribute to others.  This software was authored by:
+
+Mathematics and Computer Science Division
+Argonne National Laboratory, Argonne IL 60439
+
+(and)
+
+Department of Computer Science
+University of Illinois at Urbana-Champaign
+
+
+			      GOVERNMENT LICENSE
+
+Portions of this material resulted from work developed under a U.S.
+Government Contract and are subject to the following license: the Government
+is granted for itself and others acting on its behalf a paid-up, nonexclusive,
+irrevocable worldwide license in this computer software to reproduce, prepare
+derivative works, and perform publicly and display publicly.
+
+				  DISCLAIMER
+
+This computer code material was prepared, in part, as an account of work
+sponsored by an agency of the United States Government.  Neither the United
+States, nor the University of Chicago, nor any of their employees, makes any
+warranty express or implied, or assumes any legal liability or responsibility
+for the accuracy, completeness, or usefulness of any information, apparatus,
+product, or process disclosed, or represents that its use would not infringe
+privately owned rights.