var (finally! :), changed the api nav so it now shows the full tree with the
current item unfolded + siblings of itself and all parents (+ children if it's
a namespace item).
--HG--
branch : trunk
that build_namespace_view isn't called for anything but namespaces anymore,
made that parts of documents are hidden at first (with a link to 'open' them).
--HG--
branch : trunk
guido