Add sub-option all

Overlap/plot_traj.py

@@ -102,7 +102,7 @@ if __name__ == "__main__":
     parser.add_argument("shpc_dir", help = "directory containing SHPC, with "
                         "visible eddies at all dates")
     parser.add_argument("-l", "--label",
-                        choices = ["root", "leaf", "split", "merge"])
+                        choices = ["root", "leaf", "split", "merge", "all"])
     parser.add_argument("-s", "--save", metavar = "format",
                         help = "Save file to specified format")
     parser.add_argument("-t", "--time", action = "store_true",