Merge remote branch 'symoon/master'

* symoon/master:
  Fix reference rewrite rule
  Canonical place for manuals is /doc/manuals/
  Handle a Redirect for the New Maintainers' Guide
  Handle a RewriteMap for Debian Reference
  Offer a link to DSA without knowing year (Closes: #474730)
  More Redirect previously handled by symlinks
  Handle links to translated 404 pages
  All Redirect are actually RedirectPermanent

Signed-off-by: Peter Palfrader <peter@palfrader.org>