REM_DUP

       Function to remove duplicate values from a vector.

       result = rem_dup( a, [ flag ] )

       a - vector of values from which duplicates are to be found
       flag - (optional) if supplied then when duplicates occur,
               the one with the largest value of flag is selected.
               If not supplied the the first occurence of the value
               in a is selected.     Should be a vector with the same
               number of elements as a.

       A vector of subscripts in a is returned.  Each subscript
       points to a selected value such that a(rem_dup(a,flag))
       has no duplicates.

       The returned subscripts will sort the values in a in ascending
       order with duplicates removed.

       Remove duplicate values in vector a.
               a = a( rem_dup(a) )
       Remove duplicates in vector WAVE.  When duplicate values
       are found, select the one with the largest intensity, INTE.
               sub = rem_dup( wave, inte)
               wave = wave( sub )
               inte = inte( sub )

       The UNIQ function in the User's Library uses a faster algorithm,
       but has no equivalent of the "flag" parameter

       D. Lindler  Mar. 87
       11/16/90 JKF ACC - converted to IDL Version 2.
       August 1997  -- Changed loop index to type LONG
       October 1997 -- Also changed NGOOD index to LONG
       Converted to IDL V5.0   W. Landsman   October 1997

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