Zope.app.form

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- The widget implementations have been moved to zope.formlib. This
makes this package depend on zope.formlib. The dependency of zope.formlib
on this package has been broken.

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- Added missing zope.datetime dependency.

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- Use zope.browserpage in favor of zope.app.pagetemplate.

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- Prefer zope.testing.doctest over doctestunit and adjust test output to newer
zope.schema release.

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- Use zope.component.testing in favor of zope.app.testing where possible.

- Define dummy standard_macros for test purposes. This reduces the test
dependencies by zope.app.basicskin and zope.browserresource.

- Removed the zope.app.container and zope.app.publisher testing dependencies.

- Refactored code to remove zope.app.component dependency.

- Made the tests independent of zope.app.locales.

- Reduce zope.app test dependencies by avoiding zope.app.securitypolicy and
zope.app.zcmlfiles.

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