wn_wrap -- set/clear line wrap flag

        USAGE

          wn_wrap(wn, flag)
          WINDOWPTR wn;
          int flag;

                wn -   window handle
                flag - wrap flag (TRUE or FALSE)

          Sets the line wrap flag for window functions.  If line wrap is
          true, output that exceeds the width of a window is
          automatically placed on the next line.  When the line wrap flag
          is false, output that exceeds the width of the window is lost.

        RETURNS

          Nothing.

        CAUTIONS

          None.