do_action( 'RML/Folder/Relocate', $folder, $id, $order, $force )
This action is called when a folder was relocated in the folder tree. That means the parent was not changed, only the order was changed.
||IFolder||The folder object|
||int||The new parent folder id|
||int||The (new) order number|
||boolean||If true the relocating was forced|