Add possibility to se acction not just for object instance but also for ...

Hi  :)

Please check my code and add it to official tree,
I add there possibility to set action for object itself, so where change_list.html template is used.
By this way we can prepare different import action when we need new data for our models.

Also i prepare mezzanine templates(grappeli) that can be used instead instead django one, for user who use mezzanine cms.

Regards, Hetii...