[Catalog-sig] PyPI Enhancements

["Martin v. Löwis"]

> So what remains in the document is:
> 
> - change the PyPI code so it warns on unexisting classifier
> - change the .pypirc file so it has several sections (Fred's model)
> - change the distutils register and upload commands so it works with the new
> .pypirc file,
>   and let the user choose the server in the command line 

As a feature list, this sounds right. I'm curious how you'll implement
the warning mechanism, though, through XML-RPC.

Regards,
Martin