update the outline used for VTK output when balance is called

Solution to issue #56 (closed) by updating the outlines after calling balance()

include/ALL.hpp

@@ -299,6 +299,7 @@ public:
     switch (method) {
     case LB_t::TENSOR:
       balancer->balance(loadbalancing_step);
+      calculate_outline();
       break;
     case LB_t::STAGGERED:
 
@@ -373,9 +374,11 @@ public:
       ((Staggered_LB<T,W>*)balancer.get())->setVertices(outline->data());
       */
       balancer->balance(loadbalancing_step);
+      calculate_outline();
       break;
     case LB_t::FORCEBASED:
       balancer->balance(loadbalancing_step);
+      calculate_outline();
       break;
 #ifdef ALL_VORONOI_ACTIVE
     case LB_t::VORONOI:
@@ -384,6 +387,7 @@ public:
 #endif
     case LB_t::HISTOGRAM:
       balancer->balance(loadbalancing_step);
+      calculate_outline();
       break;
     default:
       throw InvalidArgumentException(