Archive server handles relative r1 URLs

Because we are moving documents across subdomains any non-relative URLs are liable to breaking.

This fixes the bulk of them, so...

www.theguardian.com/books/Education/gendergap/story/0,,912573,00.html

...becomes a 301 response pointing at,

www.theguardian.com/education/gendergap/story/0,,912573,00.html