Create function `other_orient`

Common/util_eddies.py

@@ -167,3 +167,9 @@ def in_window(point, window):
     # (in [llcrnrlon, llcrnrlon + 360[)
 
     return longit <= urcrnrlon and llcrnrlat <= point[1] <= urcrnrlat
+
+def other_orient(orientation):
+    if orientation == "Cyclones":
+        return "Anticyclones"
+    else:
+        return "Cyclones"