copying kinetics shouldn't copy elements

model/src/main/java/lcsb/mapviewer/model/map/kinetics/SbmlKinetics.java

@@ -83,7 +83,7 @@ public class SbmlKinetics implements Serializable {
   public SbmlKinetics(SbmlKinetics original) {
     this.definition = original.getDefinition();
     for (SbmlArgument argument : original.getArguments()) {
-      addArgument(argument.copy());
+      addArgument(argument);
     }
   }