Move generated spirit docs to the sandbox

Hi,

I removed the fusion docs from trunk a while back, and replaced them
with a redirect to the sourceforge sandbox. I think we agreed to do
this for spirit as well, but I didn't at the time as I hadn't set up
the index yet, but I set that up a little while ago, you can see the
documentation at:

http://boost-sandbox.sourceforge.net/libs/spirit/doc/html/index.html

So, is it okay to go ahead with this? I haven't noticed any comments
on the fusion change. Obviously, I'll make sure they're included
correctly in the beta (which should happen automatically).

Daniel

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