Feature/kernel single paths

Utilities/src/main/java/de/uni/bremen/cluster/editing/utilities/kernel/PreProcessingKernel.java

@@ -29,6 +29,7 @@ public class PreProcessingKernel extends AlgorithmStep implements ChangeTracker<
   }
 
   public void run(ProblemInstance problemInstance) {
+    System.out.println("stated Kernel");
     this.start();
     changes.clear();
     this.problemInstance = problemInstance;
@@ -36,6 +37,7 @@ public class PreProcessingKernel extends AlgorithmStep implements ChangeTracker<
 
     doVertexPairs();
     doSinglePaths();
+    System.out.println("Kernel changes: " + changes);
 
     this.finish();
   }