[MERGE] Add current-directory information to osutils.walkdirs

[Robert Collins]

This adds the directory path-from-prefix and path-from-top information
to the output of osutils.walkdirs, which makes it easier to use - less
bookkeeping data is needed.

Cheers,
Rob
-- 
GPG key available at: <http://www.robertcollins.net/keys.txt>.
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