Z3c.form

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- Remove ":list" from radio inputs, since radio buttons can be only one value
by definition. See LP580840.

- Changed radio button and checkbox widget labels from token to value (wrapped
by a unicode conversion) to make it consistent with the parent
``SequenceWidget`` class. This way, edit and display views of the widgets
show the same label. See LP623210.

- Remove dependency on zope.site.hooks, which was moved to zope.component in
3.8.0 (present in ZTK 1.0 and above).

- Make zope.container dependency more optional (it is only used in tests)

- Properly escape JS code in script tag for the ordered-select widget. See
LP829484.

- Cleaned whitespace in page templates.

- Fix ``IGroupForm`` interface and actually use it in the ``GroupForm``
class. See LP580839.

- Added Spanish translation.

- Added Hungarian translation.

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- Better compatibility with Chameleon 2.x.

- Added \*.mo files missing in version 2.5.0.

- Pinned minimum version of test dependency ``z3c.template``.

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- Fixed coverage report generator script buildout setup.

- Note: z3c.pt and chameleon are not fully compatible right now with TAL.
Traversing the repeat wrapper is not done the same way. ZPT uses the
following pattern:
<tal:block condition="not:repeat/value/end">, </tal:block>

Chameleon only supports python style traversing:
<tal:block condition="not:python:repeat['value'].end">, </tal:block>

- Upgrade to chameleon 2.0 template engine and use the newest z3c.pt and
z3c.ptcompat packages adjusted to work with chameleon 2.0.

See the notes from the z3c.ptcompat package:

Update z3c.ptcompat implementation to use component-based template engine
configuration, plugging directly into the Zope Toolkit framework.

The z3c.ptcompat package no longer provides template classes, or ZCML
directives; you should import directly from the ZTK codebase.

Also, note that the ``PREFER_Z3C_PT`` environment option has been
rendered obsolete; instead, this is now managed via component
configuration.

Attention: You need to include the configure.zcml file from z3c.ptcompat
for enable the z3c.pt template engine. The configure.zcml will plugin the
template engine. Also remove any custom built hooks which will import
z3c.ptcompat in your tests or other places.

You can directly use the BoundPageTemplate and ViewPageTempalteFile from
zope.browserpage.viewpagetemplatefile if needed. This templates will implicit
use the z3c.pt template engine if the z3c.ptcompat configure.zcml is
loaded.

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- Remove unneeded dependency on deprecated ``zope.app.security``.

- Fixed ButtonActions.update() to correctly remove actions when called again,
after the button condition become false.

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- Declare TextLinesFieldWidget as an IFieldWidget implementer.

- Clarify MultiWidget.extract(), when there are zero items,
this is now [] instead of <NO_VALUE>

- Some typos fixed

- Fixed test failure due to change in floating point representation in Python
2.7.

- Ensure at least min_length widgets are rendered for a MultiWidget in input
mode.

- Added Japanese translation.

- Added base of Czech translation.

- Added Portuguese Brazilian translation.

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- Adjust test for the contentprovider feature to not depend on the
ContentProviderBase class that was introduced in zope.contentprovider 3.5.0.
This restores compatibility with Zope 2.10.

- Security issue, removed IBrowserRequest from IFormLayer. This prevents to
mixin IBrowserRequest into non IBrowserRequest e.g. IJSONRPCRequest.
This should be compatible since a browser request using z3c.form already
provides IBrowserRequest and the IFormLayer is only a marker interface used
as skin layer.

- Add English translation (generated from translation template using
msgen z3c.form.pot > en/LC_MESSAGES/z3c.form.po).

- Added Norwegian translation, thanks to Helge Tesdal and Martijn Pieters.

- Updated German translation.