Ftw-dictstorage

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- Nothing changed yet.

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- Drop support for Plone 4.0 and 4.1. [jone]
- Add support for Plone 5.1 [Nachtalb]

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- Declare zope dependencies.
[jone]

- Update README.
[jone]

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- Remove "self" from IDictStorage interface definitions.
This makes it possible to validate a implementation with verifyClass.
[jone]

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- added test-buildout for plone 4.1
[eschmutz]

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- Fixed signature of some class methods
[lgraf]