trying to fix broken test (between minex and mrnex algorithm; not for

mdijkstra right now)

src/main/java/it/unibz/inf/isochrone/algorithm/Isochrone.java

@@ -181,7 +181,7 @@ public abstract class Isochrone {
 			dConnections = prepareDiscreteLinks(node, links);
 			updateNodeQueue(expandDiscreteLinks(dConnections));
 
-			output.addLinks(links.parallelStream().filter(PREDICATE_LINK_CONT));
+			output.addLinks(links.stream().filter(PREDICATE_LINK_CONT));
 			if (qIsExpiring && node.isExpired()) {
 				removeNode(nodeId);
 			}