Plone-supermodel

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New:

- Python 2.6 and Plone 4.3 no longer officially supported. It might
still work, but no special effort is made to keep this compatible.
[maurits]

- Support to define the order of fieldsets.
[jensens]

Fixes:

- Remove temporary fix regarding test failures on Zope 4, as it's already fixed.
[thet]

- Update setup.py url to point to github location.
[esteele]

- Unset _init_field flag on init completion.
[metatoaster]

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Fixes:

- Add temporary fix for a test failure within a Zope 4 environment.
[pbauer]

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- Code modernization: sorted imports, use decorators, utf8 headers.
[jensens]

- Add i18n serialization from schema value to XML model
[datakurre]

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- Support Choice fields with terms containing distinct title from value
as option, while preserving backward-compatible round-trip for all
Choice fields where title is not distinct from value.
[seanupton]

- Fix parsing of empty Choice term to u'', not None, which addresses a
cause of https://github.com/plone/plone.app.dexterity/issues/49
[seanupton]

- Explicitly construct SimpleTerm instances for each Choice field
element, instead of relying on zope.schema constructors to do so.
This ensures that all terms have non-None title attributes.
[seanupton]

- Tests for ChoiceHandler serialization and parsing.
[seanupton]

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- Add invariant tag, a sub-element of schema, that accepts a dotted name as
a value. Invariants must provide plone.supermodel.interface.IInvariant.
[smcmahon]

- Replace deprecated test assert statements.
[timo]

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- Add defaultFactory tag for Dexterity XML. Define an interface
IDefaultFactory. defaultFactories specified via XML must implement it or
IContextAwareDefaultFactory.
[smcmahon]