==================
- Don't depend on the ``hook`` extra of zope.component, as we don't need
it explicitly.
- Import security settings (Allow, Deny, Unset) in the ``interfaces``
module from the ``zope.securitypolicy.settings``, added in previous
release instead of old ``zope.app.security.settings``.
The ``zope.app.security`` will be adapted to import them from
``zope.securitypolicy.interfaces``.
- Use ``_z_instances`` instead of ``__instances__`` for storing instances
for ``zope.securitypolicy.settings.PermissionSetting`` singleton
implementation, because __*__ name pattern is reserved for special
names in python.
- Add security protections for the ``PermissionSetting``.
- Improve documentation formatting, add it to the package's long
description.
- Remove unneeded dependencies.
- Remove old zpkg-related files and zcml slugs.