implemented functions: class_levels_count() and class_hierarchy_iterator()
implemented functions: class_levels_count() and class_hierarchy_iterator()

mitdbg/aurum-datadiscovery,mitdbg/aurum-datadiscovery,mitdbg/aurum-datadiscovery,mitdbg/aurum-datadiscovery,mitdbg/aurum-datadiscovery,mitdbg/aurum-datadiscovery