Message 325385 - Python tracker

Well, hasn't this languished for a while.

I've talked with Benjamin, and he's OK with just removing the "Porting Extension Modules to Python 3" HOWTO, and replacing it by links to external guides that do a much better job at documenting this.

Also, Python 2.6 and 3.0 is EOL; it should be fine to scrub capsulethunk.