allow list, create, and delete_all to act on a user-provided collection stored in...

allow list, create, and delete_all to act on a user-provided collection stored in the stash, similar to how object works. additionally, change how basic_model_action picks a default target if none is given. the exists() check for stash->{object} is just asking for autovivification-related bugs and the new behavior should be 100% compatible with the added benefit of DTRT if a collection is placed in {collection}. This whole system really needs an overhaul at some point, but I am waiting for catamoose to support roles in controllers so we can do it right.