Calculate start and stop index for mapping sliced index

        :param index_slice: sliced index?
        :param axis: current axis to calculate
        :return: slice object as calculated

def slice_local_to_global(self, index_slice, axis=0):
        """ Calculate start and stop index for mapping sliced index

        :param index_slice: sliced index?
        :param axis: current axis to calculate
        :return: slice object as calculated
        """

        local_start = self.int_local_to_global_start(index_slice.start, axis)
        local_stop = self.int_local_to_global_stop(index_slice.stop, axis)

        return slice(local_start,local_stop,index_slice.step)