Plone.schemaeditor

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Fixes:

- Fix tests for fieldset ordering changes in plone.supermodel.
[thet]

- Update url in setup.py to point to github.
[esteele]

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Fixes:

- Remove unused locales folder, translations are now in plone.app.locales
[vincentfretin]

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Fixes:

- Use plone domain for translations.
[gforcada]

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- Make ``plone.protect.utils.addTokenToUrl`` a soft dependency, making this
package usable in Plone < 5.0.
[thet]

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- Supports additionalSchemata in field Add form.
[ebrehault]

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- Add undeclared zope.cachedescriptors dependency.
[timo]

- Fix javascript to reorder fields. It was conflicting with
mockup jquery.event.(drag|drop).
[vangheem]

- Add support for non-destructive editing of attributes with i18n
Message values
[datakurre]

- Add a "protected" method to IFieldFactory that may be used to determine
if a particular field must be non editable and not movable using the editor
(just like a behavior field).
Override it for custom behavior in a subclass.
[ebrehault]