Pick a set of nodes based on traceroute characteristics

[teunvink]

Feature request: make traces from all nodes, but only graph the top/bottom X hosts based on hop count, latency and possibly other characteristics of the trace.

[teunvink]

top/bottom hosts based on hop count has now been added (-p flag)

[teunvink]

864bbd5 provides filtering based on ASN/IP in traces.