Grokcore.content

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- Update tests.

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- Fix updateOrder that would create a new PersistentList object in the
database each time the order is updated.

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- Introduce ObjectEditedEvent which is meant to used when the
attribute of an object are edited. This makes possible to easily
distinguish it from generic and container modification operations.

- Fix a bug where the OrderedContainer could get corrupted in case
updateOrder() would have been called with a list containing multiple
occurrences of a existing key in the mapping.

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- Use newer grokcore.component.

- Made package comply to zope.org repository policy.

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- Created ``grokcore.content`` in January 2010 by factoring basic
component base classes out of Grok.