[Distutils] [Catalog-sig] Prototype setuptools-specific PyPI index.

["Martin v. Löwis"]

> WRT zc.buildout, refreshing a buildout with just ZODB installed in it  
> takes about 45 seconds for me using PyPI and about 5 seconds using  
> the experimental index.

Can you kindly provide a measurement for the index at
http://cheeseshop.python.org/simple/ as well?

Thanks,
Martin