Correct error in SOlutionDistance

src/main/java/be/cylab/java/wowa/training/SolutionDistance.java

@@ -9,9 +9,6 @@ import java.util.List;
  */
 public class SolutionDistance extends AbstractSolution {
 
-    private double[] weights_w;
-    private double[] weights_p;
-    private double distance = Double.POSITIVE_INFINITY;
 
     /**
      * SolutionDistance constructor. Needs weight number as parameter