Zope.app.form

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- Adapt to the upcoming zope.schema release 3.5.1 which will also silence the
spurious `set` failures.

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- use zope.browser.interfaces.ITerms instead of zope.app.form.browser.interfaces

- Depending on zope.schema>=3.5a1 which uses the builtin ``set`` instead of the
``sets`` module.

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- The URIDisplayWidget doesn't render an anchor for empty/None values.

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- Get rid of deprecated usage of LayerField from
zope.app.component.back35, replaced by
zope.configuration.fields.GlobalInterface.

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- Fixed restructured text in doc tests to unbreak the PyPI page.