[merge][#249908] avoid bad text wrapping when generating documentation

[Martin Pool]

https://bugs.edge.launchpad.net/bzr/+bug/249908 complains that the
automatic text wrapping done by some code that generates documentation
can sometimes produce output that's not valid ReST.  I believe a
similar problem occurred in the 1.13 release process.

This also moves generate_docs.py which caused some confusion by being
in the root directory, and helps autoresolve work again on NEWS.

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