Added sto*_shared tag

                    Tag('sto%s_ratio' % s.name,

                        partial(lambda x: '%0.2f' % (1 - float(x.available) / x.capacity)

                                if x.available is not None and x.capacity is not None else None, s), 5, 5),

                    Tag('sto%s_shared' % s.name, partial(lambda x: {True: 'yes', False: 'no'}[s.is_shared], s)),

                ))

        self.update_path_index()