CALL SEQUENCE...
       mergef  INA INB MERG OUTPUT
 
 
      AUTHOR - J.Henderson, MAR 10/81.
      LAST REVISION: $Header: /home/cvs/RMNLIB/utils/rdiag/lspgm/mergef.ptn,v 4.9 2014/09/25 20:20:51 dugas Exp $
 
 
      PURPOSE...
       MERGES TWO FILES INA,INB INTO ONE FILE MERG. ORDERING IS BY
       TIMESTEP NUMBER (WORD 2 OF THE LABEL). TIES ARE RESOLVED IN
       FAVOR  OF THE FIRST FILE (INA).  BOTH INPUT FILES SHOULD BE
       ORDERED BY TIMESTEP NUMBER.  AFTER ONE FILE IS FINISHED THE
       OTHER FILE IS COPIED TO THE MERGE FILE WITHOUT CHECKING THE
       TIMESTEP NUMBER. ALL RECORDS SHOULD BE SAME SIZE. 
 
       NOTE: THE PROGRAMS ATTEMPS TO PREVENT A THE REPETITION OF
             RECORDS HAVING SAME NAME,TIMESTEPS AND LEVELS THAT
             COULD BE EXTRACTED FROM THE TWO FILES.
 
 
 
      INPUT FILES...
       INA  = FIRST INPUT FILE
       INB  = SECOND INPUT FILE
 
      OUTPUT FILE...
       MERG = MERGED CONCATENATION OF THE TWO INPUT FILES
 
 
      EXIT CONDITIONS...
        0 NO PROBLEMS
        1 FILES DO NOT CONTAIN SAME TYPE OF DATA
        2 CANNOT CHANGE/MIX PACKING TYPE
        3 PREMATURE EOF ON FILE INA
        4 PREMATURE EOF ON FILE INB