Clustering coefficient code.
mark_component added.
added check_connection.
Added BFS distance finding.
BFS route finding and centrality.
Added mark_component_nr. Doesn't work.
Non-recursive mark_component works. Added centrality_max. Doesn't work.
DOES work. Required path() function.
Start of work at bridge edge finding.
Added count_connected_components.
Added remove_edge.
Added is_bridge_edge().
Added list_edges.
Added list_bridge_edges.
Not that much changed.
Added remove_node function.
Added remove_unconnected_nodes.
Added reset_G and edges_to_nbors.
Added graph_from_edge_list.
Added fleury. Need to be tested.