Link fix distanceFunction global var leak

examples/js/src/example-papaparsing/linkForce.js

@@ -12,8 +12,8 @@ function startLinkSimulation() {
 
   if (tweakedVerOfLink) {
     force = d3.forceLinkFullyConnected()
-              .distance(function (n) {
-                return distanceFunction(n.source, n.target, props, norm);
+              .distance(function (n, m) {
+                return distanceFunction(n, m, props, norm);
               });
   }
   else {