Do not check default properties when displaying structure

        ("Refine with METHOD (trap, siphon, utrap, usiphon, none, all)")

        , Option "s" ["structure"]

        (NoArg (\opt -> Right opt { optPrintStructure = True }))

        (NoArg (\opt -> Right opt {

                                  optPrintStructure = True,

                                  optProperties = case optProperties opt of

                                                       PropDefault -> PropList []

                                                       (PropList props) -> PropList props

                        }))

        "Print structural information"