Plone.app.z3cform

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- Fix the single checkbox widget to cope with widgets with a __call__ method.
[davisagli]

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- Remove hard-coded &x25a0; (box) markers from required labels to match
changes made in sunburst/public.css and archetypes. Fixes double required
markers in Plone 4.2rc1.

- Pull form help inside label tag and make it a span rather than a div. The
purpose is to improve accessibility by making the semantic connection between
label and help. Related to http://dev.plone.org/ticket/7212

- Use ViewPageTemplateFile from zope.browserpage.
[hannosch]

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- Prevent empty error divs from being generated if errors are already associated
with a field.
[davidjb]

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- Corrected formatting for errors on the FieldWidgets object (i.e. from
invariants). This closes http://code.google.com/p/dexterity/issues/detail?id=238
[davisagli]

- Added the ``i18n:domain`` attribute in the first ``div`` of ``widget.pt`` in order to make the
"required" tooltip translatable. Fixes http://dev.plone.org/plone/ticket/12209
[rafaelbco]

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- Make sure group errors get styled like field errors.
[davisagli]

- Include group and field descriptions as structure.
[davisagli]

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- Make it possible to add a custom CSS class to a form by setting its
``css_class`` attribute.
[davisagli]

- Match plone.z3cform's template in including the form description as
structure.
[davisagli]