Benchmark tests on a random digraph (n = 100000, m = 1000000)

StaticDigraph - Building        0.224965

StaticDigraph - Iteration
  NodeIt:    9.06944e-05        9.11951e-05
  ArcIt:     0.000907302        0.000905704
  OutArcIt:  0.0028306          0.00367792
  InArcIt:   0.0604978          0.0603309
