Z3c-formui

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- No longer using deprecated ``zope.testing.doctest`` but built-in
``doctest`` instead.

- Fixed tests so they do not break for `z3c.form` 2.5.0.

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- Fixed tests so they do not break for `z3c.form` 2.2.0.

- Using ``requiredInfo`` property (introduced in `z3c.form` 2.0.0) to
render the information about required fields. This property returns
an i18n message id making the information translateable.

- Added support for groups containing groups: They get displayed now.

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- Feature: Don't show required info hint if there's no required fields.

- Bug: Don't render add forms when redirecting as well.

- Bug: Fix redirection tests with newer zope.publisher that restricts
untrusted redirects to different domains.

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- Feature: Added support for context-specific template lookup, introduced in
`z3c.template` 1.2.0 - templates can now be registered using (view, request,
context) discriminator.

- Feature: Added support for `z3c.pt` templates using `z3c.ptcompat`
compatibility package.

- Feature: Added layout support for `IAdding` component based add forms.

- Feature: Added CSS for multi-widget which was added in `z3c.form` 2.0.0.

- Bug: Changed usage of ``template/macros/*`` to ``macro:*``, because the
first one doesn't work when we override a form template and use the form
macro, registered with this package.

- Bug: Don't do rendering in form's `__call__` method when request is a
redirection.

- Bug: Reformatted long-description to render properly on pypi.

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- Bug: Corrected typos and unwanted unicode characters.

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- Bug: Fixed up meta-data and the release.