Rimosso ArraySequenceFake. Implementato positions() in NodePositionList. Creato il DefaultComparator. Prima implementazione di SortedPriorityList

position/PositionList.java

@@ -37,5 +37,8 @@ public interface PositionList<E> extends Iterable<E> {
   public E set(Position<E> p, E e) throws InvalidPositionException;
 
 
+  public Iterator<Position<E>> positions();
+
+
 }