Add test `Edgelist_Isic_2_nx`

Trajectories/tests.json

@@ -18,6 +18,15 @@
 	    "segments.gv"
 	]
     },
+    {
+	"title": "Edgelist_Isic_2_nx",
+	"command":
+	[
+	    "$src_dir/Trajectories/segments_networkx.py",
+	    "$src_dir/Trajectories/edgelist_Isic_2.csv",
+	    "segments.gv"
+	]
+    },
     {
 	"title": "Segments",
 	"command":