Jessica Tallon bc75a65327 Add Graveyard model
This adds the Graveyard model which is used when a model is deleted, it
stores the important "shell" information on the model so it can
hard-delete the real object. It also remaps the GenericModelReference
references to the new Graveyard model.

This also moves the soft deletion setting from __model_args__ to
"deletion_mode" on the model.
2015-10-07 14:40:44 +02:00
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2015-10-07 14:40:44 +02:00
2015-10-07 14:40:44 +02:00
2015-10-07 14:40:44 +02:00