[gutvol-d] New canonical URL for etext directories

The new canonical url: http://www.gutenberg.org/files/12345 will redirect to: http://www.gutenberg.org/dirs/1/2/3/4/12345/ Of course, this works for all ebooks that are stored in the new filesystem. Old ebooks that have not yet been moved to the new filesystem will NOT work. Note: the redirect takes one extra round trip to the server, so the second url is faster. If response time is important, use the second url. -- Marcello Perathoner webmaster@gutenberg.org