DB_OR

       Combine two vectors of entry numbers, removing duplicate values.

       DB_OR can also be used to remove duplicate values from any longword
       vector

       LIST = DB_OR( LIST1 )          ;Remove duplicate values from LIST1
               or
       LIST = DB_OR( LIST1, LIST2 )   ;Concatenate LIST1 and LIST2, remove dups

       LIST1, LIST2 - Vectors containing entry numbers, must be non-negative
                       integers or longwords.

       LIST - Vector containing entry numbers in either LIST1 or LIST2

       DB_OR returns where the histogram of the entry vectors is non-zero

       ZPARCHECK - checks parameters

       Written,     W. Landsman             February, 1989
       Check for degenerate values  W.L.    February, 1993
       Converted to IDL V5.0   W. Landsman   September 1997

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