Steamline objectPosition init

check for resetting on the same position with different class, which
should not happen
Ie it’s ok for an object to push another object up,
but not for an instruction to land on code

lib/risc/position/object_position.rb

@@ -3,7 +3,7 @@ module Risc
     class ObjectPosition
       attr_reader :at , :object
 
-      def initialize( at , object)
+      def initialize( object, at)
         @at = at
         @object = object
         raise "not int #{self}-#{at}" unless @at.is_a?(Integer)