Zope-security

==================

- Fix a regression introduced in 3.8.1: ``zope.location``\'s LocationProxy
did not get a security checker if ``zope.security.decorator`` was not
imported manually. Now ``zope.security.decorator`` is imported in
``zope.security.proxy`` without re-introducing the circular import fixed in
3.8.1.

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- Fix a test that failed on Python 2.7.

==================

- Fix circular import beween ``zope.security.decorator`` and
``zope.security.proxy`` which led to an ``ImportError`` when only
importing ``zope.security.decorator``.

==================

- Add tests for our own ``configure.zcml``.

- Add ``zcml`` extra dependencies; run related tests only if
``zope.configuration`` is available.

- Run tests related to the ``untrustedpython`` functionality only if
``RestrictedPython`` is available.

==================

- Prefer the standard library's ``doctest`` module to the one from
``zope.testing``.

- Ensure ``PermissionIdsVocabulary`` directly provides ``IVocabularyFactory``,
even though it might be unnecessary because ``IVocabularyFactory`` is
provided in ZCML.

- Remove the dependency on the zope.exceptions package: zope.security.checker
now imports ``DuplicationError`` from zope.exceptions if available, otherwise
it defines a package-specific ``DuplicationError`` class which inherits from
Exception.

==================

- Add compatibility with Python 2.6 abstract base classes.