Persistence

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- LP 587760: Handle tp_basicsize correctly.

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- Removed undeclared testing dependency on zope.testing.

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- Update to include ExtensionClass 2.13.0.

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- Added support for method cache in Persistence. Patch contributed by
Yoshinori K. Okuji. See https://bugs.launchpad.net/zope2/+bug/486193.

- Updated C includes to ExtensionClass 2.12.0.

- Updated package metadata and remove old build artifacts.

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- First egg release.