Z3c.schema

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- Add nl translations.

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- Updated tests to run with ``zope.schema`` >= 3.6, thus requiring at least
this version.

- Using Python's ``doctest`` module instead of depreacted
``zope.testing.doctest[unit]``.

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- Added french translations.

- Added doctests to ``long_description`` so they appear on PyPI.

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- Humanized exception's doc strings.
- Added translations support.
- Added german translations.
- Added russian translations.
- Changed mailing list address to zope-dev at zope.org, as
zope3-dev is retired now.

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- Initial release on PyPI.

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- Feature: Added ``DateSelect`` field.