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 }
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
run faster. This fixes ticket #235.
Incidentally, refactor exif and search to use the same patterns
overall so that if you understand one, you understand the other and
they generally use the same strings for localization.
