adding back removed stuffs

src/backend/Board.java

@@ -416,6 +416,13 @@ public class Board {
 	    }
 	}
 	
+	
+	public Board(Board board) {
+		//TODO
+
+	}
+	
+	
 	public void playMove(Move move) {
 	    // Save current state before move for undo
 	    undoStack.push(toFileRep());