Zope-security

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- Make C code compatible with Python 2.5 on 64bit architectures.

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

- Add ``frozenset``, ``set``, ``reversed``, and ``sorted`` to the list of
safe builtins.

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

- Changed title for ``zope.security.management.system_user`` to be more
presentable.

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

- Backport a fix made by Gary Poster to the 3.4 branch:
Fix for LP bug 181833 (from Gustavo Niemeyer). Before "visiting" a
sub-object, a check should be made to ensure the object is still valid.
Because garbage collection may involve loops, if you garbage collect an
object, it is possible that the actions done on this object may modify the
state of other objects. This may cause another round of garbage collection,
eventually generating a segfault (see LP bug). The ``Py_VISIT`` macro does
the necessary checks, so it is used instead of the previous code.

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

- Add dependency on ``zope.thread`` to setup.py; without it, the tests were
failing.

- Backport a fix made by Albertas Agejevas to the 3.4 branch. He
fixed a bug in DecoratedSecurityCheckerDescriptor which made
security-wrapping location proxied exception instances throw
exceptions on Python 2.5. See
https://bugs.launchpad.net/zope3/+bug/251848

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

- Make C code compatible with Python 2.5 on 64bit architectures.