Plone.portlets

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New features:

- Support Python 3. [davisagli]

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Fixes:

- Use zope.interface decorator.
[gforcada]

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Fixes:

- Rerelease to fix problem on test server. [maurits]

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Fixes:

- Do not break in placeless portlet retriever if there is no underlying code
available for existing portlet assignment.
[vipod]

- Prevent possible unicode errors when creating portlet hashes. [wichert]

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- Added an adapter and IBlockingPortletManager marker interface which portlet
managers can provide to block parent contextual portlets by default.
[elro]

- Delegate to ILocalPortletAssignmentManager for category blacklist retrieval.
This allows a custom adapter to override the default blacklist settings per
portlet manager.
[elro]

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- Avoid some test dependencies.
[hannosch]

- Graceful handling of portlets with missing implementation.
[do3cc]