fix random generator capacity, add Dinic's algo, add options for filtering empty flows & displaying residual graph

src/algorithms/mod.rs

@@ -1,5 +1,7 @@
 mod edmonds_karp;
 mod ford_fulkerson;
+mod dinic;
 
 pub use ford_fulkerson::ford_fulkerson;
-pub use edmonds_karp::edmonds_karp;
+pub use edmonds_karp::edmonds_karp;
+pub use dinic::dinic;