ROUTING_STORAGE_HOST_LEVEL = xbt_lib_add_level(storage_lib, routing_storage_host_free);
ROUTING_STORAGE_TYPE_LEVEL = xbt_lib_add_level(storage_type_lib, routing_storage_type_free);
SURF_STORAGE_LEVEL = xbt_lib_add_level(storage_lib, surf_storage_resource_free);
ROUTING_STORAGE_HOST_LEVEL = xbt_lib_add_level(storage_lib, routing_storage_host_free);
ROUTING_STORAGE_TYPE_LEVEL = xbt_lib_add_level(storage_type_lib, routing_storage_type_free);
SURF_STORAGE_LEVEL = xbt_lib_add_level(storage_lib, surf_storage_resource_free);