Zope.app.form

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- Avoid the ``zope.app.basicskin`` dependency, by defining our own FormMacros.

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- Internationalized 'Invalid value' used with ConversionError
- Added dependency on transaction and test dependency on zope.app.component.
- Moved dependencies on ZODB3 and zope.location to the test extra.
- Reduced the dependency on zope.app.publisher to a dependency on
zope.browsermenu plus a test dependency on zope.browserpage.

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- Fix unittest failure due to translation update.

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- Use standard properties instead of `zope.cachedescriptors`.

- Require `zope.browser` 1.1 instead of `zope.app.container` for IAdding.

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- Fixed invalid markup.

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- Fixed bug where OrderedMultiSelectWidget did not respect the widgets
size attribute.

- Fixed bug in SequenceWidget where it crashed while trying to iterate
a missing_value (None in most of cases) on _getRenderedValue.

- Adapt to removal of deprecated interfaces from zope.component.interfaces.
The IView was moved to zope.publisher and we use our custom IWidgetFactory
interface instead of removed zope.component.interfaces.IViewFactory.

- Fix tests to work on Python 2.6.