Zope-app-container

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- Reimplemented the ``BTreeContainer`` so that it directly accesses the btree
methods (removed an old TODO)

- Removed usage of deprecated ``LayerField``.

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

- Fixed bug: Error thrown during ``__setitem__`` for an ordered container
leaves bad key in order

- Fixed https://bugs.launchpad.net/zope3/+bug/238579,
https://bugs.launchpad.net/zope3/+bug/163149: Error with unicode
traversing

- Fixed https://bugs.launchpad.net/zope3/+bug/221025: The Adding menu
is sorted with translated item by using a collator (better localized
sorting)

- Fixed https://bugs.launchpad.net/zope3/+bug/227617:
- prevent the namechooser from failing on '+', '' and '/'
- added tests in the namechooser
- be sure the name chooser returns unicode

- Fixed https://bugs.launchpad.net/zope3/+bug/175388: The setitem's
size modification is now done in ``setitemf``: setting an existing
item does not change the size, and the event subscribers should see
the new size instead of the old size.

------------------

- Added an ``IBTreeContainer`` interface that allows an argument to the
``items``, ``keys``, and ``values`` methods with the same semantics as for
a BTree object. The extended interface is implemented by the
``BTreeContainer`` class.

----------------

- Updated bootstrap script to current version.

- Store length of ``BTreeContainer`` in its own ``Length`` object for faster
``__len__`` implementation of huge containers.

- Send ``IObjectModifiedEvent`` when changing the title through the
``contents.html`` view.
This fixes https://bugs.edge.launchpad.net/zope3/+bug/98483.

- Resolve ``ZopeSecurityPolicy`` and ``IRolePermissionManager`` deprecation
warning.

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- Initial release as a separate project, corresponds to ``zope.app.container``
from Zope 3.4.0a1.