Print number of weakly connected components

Analysis/report_graph.py

@@ -69,6 +69,8 @@ if __name__ == "__main__":
           "with sufficient area), plus the number of interpolated eddies, "
           "minus the number of isolated nodes.)")
     print("Number of edges:", G.number_of_edges())
+    print("Number of weakly connected components:",
+          nx.number_weakly_connected_components(G))
     n1 = 0
     n2 = 0
     print("\nMerging:")