*-- Author : S.Burke / J.V. Morris
      SUBROUTINE FKSUB(C1,C2,C3)
**********************************************************************                                        
*                                                                    *                                        
* Subtracts two 5*5 symmetric matrices                               *                                        
*                                                                    *                                        
* Output is C3 = C1 - C2 (lower half only)                           *                                        
*                                                                    *                                        
**********************************************************************                                        
**********************************************************************                                        
*