Extensionclass

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- Removed old build artifacts and some metadata cleanup.

- Added support for method cache in ExtensionClass. Patch contributed by
Yoshinori K. Okuji. See https://bugs.launchpad.net/zope2/+bug/486182.

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- Further 64-bit fixes (Python 2.4 compatibility).

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- Fixed 64-bit compatibility issues for Python 2.5.x / 2.6.x. See
http://www.python.org/dev/peps/pep-0353/ for details.

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- Initial egg release.