retrieve related ORMs. If we tack a find_all() on the end, it breaks
the User_Definition interface so create User_Model::groups() and
Groups_Model::users() as glue.
Bagging the User_Definition and Group_Definition abstract classes and replacing them with interfaces with the same names.
Make sure all the unit tests work.
Old API: $obj->original("field_name")
New API: $obj->original()->field_name
This allows us to revert the varous xxx_updated events back to passing
an original ORM as well as the the updated one. This makes for a
cleaner event API.
Old API: comment_updated($comment) { $comment->original("field_name") }
Old API: comment_updated($old, $new) { $old->field_name }
related events from within the model handling code. The only
exception to this currently is item_created which is challenging
because we have to save the item using ORM_MPTT::add_to_parent()
before the object itself is fully set up. When we get that down to
one call to save() we can publish that event from within the model
also.
1) The item_updated event no longer takes the old and new items.
Instead we overload ORM to track the original data and make
that available via the item. This will allow us to move event
publishing down into the API methods which in turn will give us
more stability since we won't require each controller to remember
to do it.
2) ORM class now tracks the original values. It doesn't track
the original relationships (no need for that, yet)
3) Added new events:
item_deleted
group_deleted
user_deleted
