[patch] Simplify implementation of `get_model_and_form_class`

[Satoru Logic]

In django.views.generic.create_update.get_model_and_form_class, a form_class is constructed this way

        # The inner Meta class fails if model = model is used for some reason.
        tmp_model = model
        # TODO: we should be able to construct a ModelForm without creating
        # and passing in a temporary inner class.
        class Meta:
            model = tmp_model
        class_name = model.__name__ + 'Form'
        form_class = ModelFormMetaclass(class_name, (ModelForm,), {'Meta': Meta})

When I looked into the django.forms.models module I found a function called modelform_factory that can make this much simpler:

form_class = modelform_factory(model)

[Matthias Kestenholz]

Even though there's an upcoming refactoring of generic views using class-based views I think this patch makes sense, if only to avoid repetition.

[Russell Keith-Magee]

Function-based generic views were deprecated by the introduction of class-based views in [14254]. Class-based views should solve this problem.

[Jacob]

Milestone 1.3 deleted