[Python-3000] PEP: Eliminate __del__

[Antoine Pitrou]

FWIW and in light of the thread on removing __del__ from the language, I
just posted Yet Another Recipe for automatic finalization:
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/519621

It allows writing a finalizer as a single __finalize__ method, at the
cost of explicitly calling an enable_finalizer() method with the list of
attributes to keep alive on the "ghost object".

Antoine.