Z3c.formui

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- Feature: Mark a widget row with the "required" class when the widget is
required. Similarly, when the widget has an error attached, add the "error"
class to the widget row. That allows you to change the styles of the label
and the widget if it is reuqired.

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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.