Copyright (c) 2001 Dr Brian Gladman <brg@gladman.uk.net>, Worcester, UK
   
   TERMS

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:
   1. Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
   2. Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.

   This software is provided 'as is' with no guarantees of correctness or
   fitness for purpose.
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