FTKEEPROW

       Subscripts (and reorders) a FITS table.  A companion piece to FTDELROW.

       ftkeeprow, h, tab, subs

       h    = FITS table header array
       tab  = FITS table data array
       subs = subscript array of FITS table rows.  Works like any other IDL
               subscript array (0 based, of course).

       h and tab are modified

       Written by R. S. Hill, ST Sys. Corp., 2 May 1991.
       Converted to IDL V5.0   W. Landsman   September 1997

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