GUI -- Test events: unpinned the first node; increased a few link widths.
 - added alerts pane to framework.
 - added library registration mechanism to framework.
 - created d3Utils library
 - reimplemented drag behavior of nodes.

Change-Id: I501f4ab6eded8393948cede903573580599258b1
diff --git a/web/gui/src/main/webapp/json/eventTest_15.json b/web/gui/src/main/webapp/json/eventTest_15.json
index 3622122..30ba9f3 100644
--- a/web/gui/src/main/webapp/json/eventTest_15.json
+++ b/web/gui/src/main/webapp/json/eventTest_15.json
@@ -10,8 +10,8 @@
       "?"
     ],
     "metaUi": {
-      "x": 840,
-      "y": 290
+      "Zx": 840,
+      "Zy": 290
     }
   }
 }