GDP: output website changed

[Graham Percival]

Hi all,

Thanks to a generous offer from Reinhold Kainhofer, we now have a more 
stable location for the GDP output.

You should not need to change any bookmarks, though.  The main GDP 
website is still here:
http://web.uvic.ca/~gperciva/

The link to "GDP output" has been changed from opihi (which was at the 
mercy of external forces, and which I never actually asked permission 
for hosting our docs :)  to Reinhold's webserver.

Cheers,
- Graham