Save orientation of eddies in `expanded_traj.json`

Trajectories/trajectories.py

@@ -203,7 +203,8 @@ with open("traj_segm.json", "w") as outfile:
 print("Created traj_segm.json.")
 
 with open("expanded_traj.json", "w") as outfile:
-    json.dump({"e_overestim": g.gp.e_overestim, "traj": expanded_traj},
+    json.dump({"orientation": g.gp.orientation,
+               "e_overestim": g.gp.e_overestim, "traj": expanded_traj},
               outfile, separators = (',', ':'))
 
 print("Created expanded_traj.json.")