def supports_calendar_types_for_conversion(self, source_calendar_type=None, target_calendar_type=None):
Tests if a given calendar conversion is supported.

        arg:    source_calendar_type (osid.type.Type): the type of the
                source calendar
        arg:    target_calendar_type (osid.type.Type): the type of the
                target calendar
        return: (boolean) - ``true`` if the given source and target
                conversion is supported, ``false`` otherwise
        raise:  NullArgument - ``source_calendar_type`` or
                ``target_calendar_type`` is ``null``
        *compliance: mandatory -- This method must be implemented.*