Plone.app.lockingbehavior

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Fixes:

- Use a functional layer to resolve test isolation problems.
[gforcada]

- Refactor doctest to an integration test and skip it for Zope 4 due to isolation problems.
[pbauer]

- Changed i18n_domain to "plone".
Requires plone.app.locales 4.3.9 or higher.
[claytonc]

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- Remove superfluous 'for'.
[fulv]

- Fix tests: redirect was changed in commit e7367258.
[jone]

- If the content is locked, the redirect points to the default view and
not to the absolute_url of the object. It avoids image opening on redirect
[parruc]

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- Fix version requirement of plone.dexterity: 1.1 is compatible.
[jone]

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- Fixed problem: locks were not released when editing content and saving
it without changing anything. Fixed by using new IEditFinishedEvent instead
of IObjectModifiedEvent.
[jbaumann]

- Fixed problem which caused widget traversal to fail.
The edit form is now protected for non-anonymous user, since locking for
anyonmous users does not work anyway.
[jbaumann]

- Initial implementation
[jbaumann]