- 100% coverage for 'ZPublisher.HTTPResponse'.

- Stop dancing the status / errmsg into / out of the headers list -- they
  aren't "headers" in any practical sense.

- Conform to PEP 8.

- Normalize imports, avoiding BBB import names.

  debugger still referred to the toplevel module ``Zope``, which was
  renamed to ``Zope2`` a long time ago.

  views.

  directive.

  is missing the indexed attribute, if determining the value raises
  AttributeError, or of the indexed attribute is empty.

  methods could not deal with ``TaintedString`` instances. Removed the
  entirely redundant ``DTMLDocument.manage_edit`` method at the same time.

  to avoid issues when creating two VirtualHostMonsters in the same
  container the VirtualHostMoster now has a default Id. It can no longer
  be selected, and the intermediary Add view is gone.

  ``changeOwnership``, do not touch any children.

  setCookie method to suppress enclosing the cookie value field
  in double quotes.

Forward port from 2.12 branch.

LP #267820

LP #351006

LP #411837