with title().

This was discovered by test_email failing with -Qnew.

Makes test_xdrlib pass.

itertools.tee->instance->attribute->itertools.tee and
itertools.tee->teedataobject->itertools.tee cycles, which can be found now
that itertools.tee and its teedataobject participate in GC, remain findable
and cleanable. The test won't fail when they aren't, but at least the
frequent hunt-refleaks runs would spot the rise in refleaks.

doesn't get cleaned up and thus leaks.

so it passes w/ -Qnew.

with or without -Qnew.

alone does not solve the leak in test_generators, unfortunately, but it is
part of test_generators' problem and it does solve other cycles.