Fixed edge case of attribute name ''.

Fixes http://www.zope.org/Collectors/Zope/2109

        in ZServer/HTTPServer

      - Collector #2116: sequence.sort() did not work properly
        locale related comparison methods

http://www.zope.org/Collectors/Zope/2118

 Log message for revision 68451:
  Allow access to ZopeIterator/PathIterator API from restricted Python
  (e.g. python expressions)

adapter to be present even when traversing just dicts. No problem, we can
set it up quite easily.

This basically finishes this branch. All tests pass, some 3rd party apps
have been tested with it. There are a few test failures in the CMF and
others (e.g. Plone), but that's mostly "their fault" (incorrect or
unexpected usage of certain things).

- Apply usual tal:omit-tag fix to make the element carrying i18n:name go away
- Disable a test that was testing madness (mixing unicode and encoded strings)