Added a linkable logic module The linkable logic module is used to signal the fact that the scope of an entity can be any linkable. Patch by: Sverre Rabbelier

Fix scope lookup for unscoped entities As scope_logic is now always set (since r1250), we need to check if it is None, rather than check if it exists. Patch by: Sverre Rabbelier

Swap the order of request key fields This will make it easier to remove scope_path as explicit key field at some point by having it as inplicit key field for all entities. Patch by: Sverre Rabbelier