Z3c.wizard

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- Adjusted dependencies, reflecting changes in zope packages: use new
packages and skip dependency to `zope.app.publisher`.

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- Bugfix for z3c.form 2.2.0 changes. Removed name definition in Step
class. This will prevent to run into an error based on the z3c.form
changes.

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- Added support for field groups in step template. (Copied over from
z3c.formui.)

- There were two metal define-slots named `header`. Renamed the first
one to `wizard-header`.

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- Remove dependency on z3c.i18n as it wasn't really used and we can
easily recreate a message factory for the "z3c" domain.

- Fixed tests to work with z3c.form 2.0.

- Added another doctest to the `long_description`.

- Changed package's mailing list address to zope-dev at zope.org instead
of the retired zope3-dev one.

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- Initial Release