def get_unit_types_for_source(self, source_unit_type=None):
Gets the list of target measure types for a given source measure type.

        arg:    source_unit_type (osid.type.Type): the type of the
                source measure
        return: (osid.type.TypeList) - the list of supported target
                measure types
        raise:  NullArgument - ``source_unit_type`` is ``null``
        *compliance: mandatory -- This method must be implemented.*