Products.cmfdifftool

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Bug fixes:

- Bug fix for dict type, because we use DataGridField.
[terapyon]

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New features:

- Add Python 2 / 3 compatibility [davilima6]

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New features:

- When field is a Relation List, get the referenced objects instead of diffing
on the actual reference objects.
[frapell]

Bug fixes:

- Fixed AttributeError: 'NoneType' if the object doesn't have the expected attribute [rristow]

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Bug fixes:

- Fix error in showing changes to objects of type "set" [deankarlen]

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Bug fixes:

- Use zope.interface decorator.
[gforcada]

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Bug fixes:

- Rerelease, as 3.1.0 was broken on one of our test servers. Should
be fine elsewhere. [maurits]