IMPORTANT much lighter RAM footprint by removing sigma indexes

cf. https://github.com/jacomyal/sigma.js/issues/340

explorerjs.html

@@ -586,7 +586,13 @@
   <script src="tinawebJS/globalUtils.js" type="text/javascript"></script>
 
   <!-- new sigma 1.2 imports -->
-  <script src="tinawebJS/sigma_v1.2/sigma.min.js" type="text/javascript" language="javascript"></script>
+  <!-- <script src="tinawebJS/sigma_v1.2/sigma.min.js" type="text/javascript" language="javascript"></script> -->
+  <script src="tinawebJS/sigma_v1.2/sigma.noIndexes.js" type="text/javascript" language="javascript"></script>
+  <!--
+  NB: our sigma.noIndexes.js has exactly the same functions & varnames as
+      the v1.2 stock sigma.(min).js but with a much lighter RAM footprint!
+      cf. https://github.com/jacomyal/sigma.js/issues/340
+  -->
   <script src="tinawebJS/sigma_v1.2/plugins/sigma.layout.forceAtlas2/supervisor.js"></script>
   <script src="tinawebJS/sigma_v1.2/plugins/sigma.layout.forceAtlas2/worker.js"></script>
   <script src="tinawebJS/sigma_v1.2/plugins/sigma.renderers.snapshot/sigma.renderers.snapshot.js"></script>