DBCOMPARE

     Display two entries in an IDL database side by side in a column format

     dbcompare, list1, list2, [items, TEXTOUT= , /DIFF]

     list1 - Integer scalar giving first entry number to be compared.
     list2 - Integer scalar giving second entry number to be compared.
 OPTIONAL INPUT-OUTPUT:
     items - items to be compared, if not supplied then all items will be
          compared.    The items can be specified in any of the following ways:
             form 1  scalar string giving item(s) as list of names
                     separated by commas
             form 2  string array giving list of item names
             form 3  string of form '$filename' giving name
                     of text file containing items (one item per line)                      line)
             form 4  integer scalar giving single item number or
                     integer vector list of item numbers
             form 5  Null string specifying interactive selection.   This
                     is the default if 'items' is not supplied
             form 6  '*'     select all items (= default)
            If items was undefined or a null string on input, then
            on output it will contain the items interactively selected.

     /DIFF - If this keyword is set and non-zero, then only the items
             in the database that differ will be printed
     TEXTOUT -  Scalar Integer (1-7) Used to determine output device.   See
               TEXTOPEN for more info.

     Output device controlled by non-standard system variable !TEXTOUT, if
     TEXTOUT keyword is not used.

     Display entries 3624 and 3625 in column form showing only the items
     that differ.
               IDL> dbcompare,3624,3625,/diff

     DB_INFO(), DB_ITEM, DB_ITEM_INFO(), DBRD, DBXVAL()
     TEXTOPEN, TEXTCLOSE

     Written,  W. Landsman            July 1996
     Converted to IDL V5.0   W. Landsman   September 1997
     Fix documentation, add Syntax display    W. Landsman   November 1998
     Replace DATATYPE() with size(/TNAME)   W. Landsman    November 2001

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