[Cython] Temps again

[Stefan Behnel]

Hi,

Robert Bradshaw wrote:
> What about the other direction, do you see any leaks?

I fixed a couple of leaks already, so it's well possible that there are
more. cython-devel definitely needs some more testing.

Dag's refcount nanny would be helpful here, although it might be enough to
just run the doctests of the test suite in a loop a couple of times and
watch the memory consumption.

Stefan