TEXTCLOSE

       Close a text outpu file previously opened with TEXTOPEN

       procedure to close file for text output as specifed
       by the (non-standard) system variable !TEXTOUT.

       textclose, [ TEXTOUT = ]

       textout - Indicates output device that was used by
               TEXTOPEN

       if !textout is not equal to 5 and the textunit is
       opened.   Then unit !textunit is closed and released

       D. Lindler  Dec. 1986  (Replaces PRTOPEN)
       Test if TEXTOUT is a scalar string   W. Landsman   August 1993
 Can't close unit -1 (Standard Output) I. Freedman  April  1994
       Converted to IDL V5.0   W. Landsman   September 1997

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