updateCell(element, value [, text])

        Modifies the content of a table cell.

        In its first form, indicates a cell by its 3D coordinates, as with
        getCell(). In its second form, indicates a cell by its element
        reference.

        If the cell is set to literal, its content is limited to its text.
        In this case, the optional argument "text" is of no use (the text
        equals the value).

        If the cell is set to numeric (float, currency, date, etc.), you
        should generally pass a literal argument as well as the value.

        This method can be replaced by the accessor cellValue which allows
        reads and writes.