Accesscontrol

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- Prevent race condition in guarded_import
(`123 <https://github.com/zopefoundation/AccessControl/issues/123>`_)

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- Provide ``AccessControl.get_safe_globals`` to facilitate safe use.

- Honor ``PURE_PYTHON`` environment variable to enable python implementation
during runtime.

- Add support for Python 3.10.

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- Fix Appveyor configuration so tests can run and wheels build.

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NOTE: This release has been yanked from PyPI due to wheel build issues.

- Fix a remote code execution issue by preventing access to
``string.Formatter`` from restricted code.

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- Add support for Python 3.9.

- Remove deprecated classes and functions in
(see `32 <https://github.com/zopefoundation/AccessControl/issues/32>`_):

+ ``AccessControl/DTML.py``
+ ``AccessControl/Owned.py``
+ ``AccessControl/Role.py``
+ ``AccessControl/Permissions.py``

- Add deprecation warnings for BBB imports in:

+ ``AccessControl/AuthEncoding.py``
+ ``AccessControl/Owned.py``
+ ``AccessControl/Role.py``
+ ``AccessControl/User.py``

- Although this version might run on Zope 4, it is no longer supported because
of the dropped deprecation warnings.

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- Add missing permission ``Manage WebDAV Locks``

- Fix regression for BBB import of users.UnrestrictedUser``
(`94 <https://github.com/zopefoundation/AccessControl/issues/94>`_)

- Add a check if database is present in ``.owner.ownerInfo``.
(`91 <https://github.com/zopefoundation/AccessControl/issues/91>`_).