def change_font_bold(bolded = false)
      validate_worksheet

      font = get_cell_font.dup
      font.set_bold(bolded)
      update_font_references(font)
    end
def change_font_bold(bolded = false)
      validate_worksheet

      font = get_cell_font.dup
      font.set_bold(bolded)
      update_font_references(font)
    end
Changes font bold settings of cell