Order:
  - Rename Ordered_Set into Order
  - Rename Ordered_Set_Organizer into Order_Organizer
  - Create deprecated aliases for Ordered_Set and Ordered_Set_Organizer
  - Change Order signature to Order( organizer, options )
  - Provide backward compatibility code for deprecated signature Order( a, organizer, options )
  - Use Set.build() to build subclass and pipelet
  - Add Order Class Methods:
    - insert_at( inserted, options, insert )
    - remove_from( removed, options, remove )
    - update_from_to( updated, options, insert, remove [, update] )