wn_locate -- locate cursor in window

        USAGE

          wn_locate(wn, row, col)
          WINDOWPTR wn;
          int row, col;

                wn  - window handle
                row - row to position to (relative to window origin)
                col - column to position to (relative to window origin)

          Position the cursor to the row and column specified.  Row and
          Column values are relative to the origin of the window (0,0
          locates the cursor in the upper left hand corner of the window
          referenced by wn).

        RETURNS

          TRUE or NULL if error

        CAUTIONS

          Values of row & col are not checked.

          The window "wn" automatically becomes the top window tile upon
          return.