Add test `Edgelist_Isic_1_nx`

Trajectories/tests.json

@@ -8,6 +8,16 @@
 	    "segments.graphml"
 	]
     },
+    {
+	"title": "Edgelist_Isic_1_nx",
+	"description": "Same as Edgelist_Isic_1, except with networkx instead of graph-tool.",
+	"command":
+	[
+	    "$src_dir/Trajectories/segments_networkx.py",
+	    "$src_dir/Trajectories/edgelist_Isic_1.csv",
+	    "segments.gv"
+	]
+    },
     {
 	"title": "Segments",
 	"command":