make "ArrayList< BackwardAction > actions" private

src/bk/Combine.java

@@ -31,7 +31,7 @@ public class Combine implements AlgorithmStage {
 	private int tblOffset;
 	private int tbrOffset;
 	private int vIndex;
-	ArrayList< BackwardAction > actions;
+	private ArrayList< BackwardAction > actions;
 	
 	public Combine( LayeredGraphNode graph )
 	{