Z3c-form

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- Bug: The 3.0.0a1 release was missing some files (e.g. ``locales``) due to an
incomplete ``MANIFEST.in``.

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- Feature: Removed several parts to be installed by default, since some
packages are not ported yet.

- Feature: Added support for Python 3.3.

- Feature: Replaced deprecated ``zope.interface.implements`` usage with
equivalent ``zope.interface.implementer`` decorator.

- Feature: Dropped support for Python 2.4 and 2.5.

- Bug: Make sure the call to the method that returns the default value
is made with a field which has its context bound.

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- Feautre: The ``updateWidgets`` method has received an argument
``prefix`` which allows setting the prefix of the field widgets
adapter.

This allows updating the common widgets prefix before the individual
widgets are updated, useful for situations where neither a form, nor
a widgets prefix is desired.

- Bug: Capitalize the messages 'no value' and 'select a value'. This change
has been applied also to the existing translations (where applicable).

- Bug: ``TextLinesConverter``: Do not ignore newlines at the end of the
inputted string, thus do not eat blank items

- Bug: ``TextLinesConverter``: ``toFieldValue()``, convert conversion
exceptions to ``FormatterValidationError``, for cases like got a string
instead of int.

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- Feature: Missing terms in vocabularies: this was a pain until now.
Now it's possible to have the same (missing) value unchanged on the object
with an EditForm after save as it was before editing.
That brings some changes with it:

* *MAJOR*: unchanged values/fields do not get validated anymore
(unless they are empty or are FileUploads)

* A temporary ``SimpleTerm`` gets created for the missing value
Title is by default "Missing: ${value}". See MissingTermsMixin.

- Feature: Split ``configure.zcml``

- Bug: ``SequenceWidget`` DISPLAY_MODE: silently ignore missing tokens,
because INPUT_MODE and HIDDEN_MODE does that too.

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- Feature: Added ``IForm.ignoreRequiredOnValidation``,
``IWidgets.ignoreRequiredOnValidation``,
``IWidget.ignoreRequiredOnValidation``.
Those enable ``extract`` and ``extractData`` to return without errors in
case a required field is not filled.
That also means the usual "Missing value" error will not get displayed.
But the ``required-info`` (usually the ``*``) yes.
This is handy to store partial state.

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- Fixed broken release, my python 2.7 windows setup didn't release the new
widget.zcml, widget_layout.pt and widget_layout_hidden.pt files. After
enhance the pattern in MANIFEST.in everything seems fine. That's probably
because I patched my python version with the \*build exclude pattern patch.
And yes, the new files where added to the svn repos! After deep into this
again, it seems that only previous added \*.txt, \*.pt files get added to
the release. A fresh checkout sdist release only contains the \*.py and \*.mo
files. Anyway the enhanced MANIFEST.in file solved the problem.