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New features:
- Add `row` container to enable column layouts for fields with `wrapper_css_class`.
[petschki] (158)
- Implement new ``z3c.form`` extensible attributes feature and cleanup
widget templates using Chameleon interpolation.
[petschki] (181)
Bug fixes:
- Add missing widget configuration for `plone.schema.jsonfield.IJSONField`.
[petschki] (185)