Collective.deletepermission

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- Nothing changed yet.

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- Add Plone 5.1 support. [mbaechtold]
- Drop Plone 4.1 support. [jone]

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- Let Site Administrators delete foreign content on site root. [jone]

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- Also patch manage_pasteObjects security deceleration the same way as manage_cutObjects.
This way it's possible to paste objects in a container, without Modify portal content
permission on the container itself.
[mathias.leimgruber]

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- Remove dependency to ftw.upgrade.
[jone]

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- Support dexterity objects.
[erral, libargutxi]