[Grok-dev] Heads up: Renamed AddForm to Form

[Philipp von Weitershausen]

 From the commit log message:

- Renamed grok.AddForm to grok.Form because there was no additional
   functionality in that base class that was specific to adding. Yes, it
   used formlib's AddForm, but none of the features that has to make
   adding objects easy for you were used (adding objects in Zope 3 is
   overly complicated anyway, thanks to IAdding). Everybody writing add
   forms was writing his/her own actions anyway, which is exactly what
   the point of a general grok.Form base class is.

- Got rid of the "form in form" weirdness. It turns out that a very,
   very simple mix-in with a custom render() method makes it possible to
   mix formlib's base classes with grok.View. This makes the ViewGrokker
   simpler and exposes more of formlib directly in Grok forms.

Apart from having to use grok.Form instead of grok.AddForm, existing 
applications shouldn't have to change.


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