[Catalog-sig] PyPI mirror system is up

["Martin v. Löwis"]

The mirror system described in PEP 381 is implemented.
We have three mirror available for clients to use,
[bcd].pypi.python.org. These mirrors are restricted
(in conformace to PEP 381) to the /simple pages, i.e.
primarily intended for download through automated clients.

This service is considered experimental until some operational
experience is gained, and until the PEP gets marked as accepted.

Regards,
Martin