Grokcore.annotation

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* The annotation object become really a contained object to be aware
of its context, and name.

* Use 1.0b1 versions.cfg in Grok's release info instead of a local
copy; a local copy for all grokcore packages is just too hard to
maintain.

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* Reupload to pypi with a correct version of Python which doesn't
have a distutils bug.

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* Created ``grokcore.Annotation`` by factoring annotation components,
grokkers and directives out of Grok.