[#249908] avoid rewrapping generated ReST and move generate_docs

[Martin Pool]

This is a partial fix for <https://bugs.launchpad.net/bzr/+bug/249908>
complaining about bad text wrapping in the manpage.  The other cases
could be fixed by fixing
<https://bugs.edge.launchpad.net/bzr/+bug/330494> and not listing all
the formats as options.

-- 
Martin <http://launchpad.net/~mbp/>
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