docs: public void printGridClusters()
  	{
  		System.out.println("List of Clusters. Total "+this.cluster_list.size()+".");
  		for(GridCluster gc : this.cluster_list)
  		{
  			System.out.println(gc.getClusterLabel()+": "+gc.getWeight()+" {"+gc.toString()+"}");
  		}
  	}