MGH_STACK__DEFINE Class Name
     MGH_Stack Purpose
  
   This class implements a last-in-first-out (LIFO) stack as a singly
      linked list. Category
  
   Miscellaneous. 
    IMPLEMENTATION: 
  
   The implementation is very straightforard. Items are added (always
  
   to the end of the stack) via the Add method and retrieved (always
  
   from the same end) via the Get method. Retrieving a value removes
  
   it from the stack. The number of values is returned by the COUNT
      property or the Count method. 
    PERFORMANCE:
      The time taken to create a stack, add 100,000 real numbers,
  
   retrieve them all then destroy the stack is 9.4 s on my PC (Compaq
      Deskpro with Pentium II 400 MHz). 
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    This software is provided subject to the following conditions:
    1.  NIWA makes no representations or warranties regarding the
    
     accuracy of the software, the use to which the software may
    
     be put or the results to be obtained from the use of the
    
     software.  Accordingly NIWA accepts no liability for any loss
    
     or damage (whether direct of indirect) incurred by any person
          through the use of or reliance on the software.
    2.  NIWA is to be acknowledged as the original author of the
    
     software where the software is used or presented in any form. 
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Modification History
  
   Mark Hadfield, 1999-10: 
              Written.