New net interface

Hm, but then K needs to track the size of the network. e.g. in best case, it's log2(N) of the network (~20 requests for a network of 1M nodes). And then there's malicious nodes, churn, etc etc. 

oh and though it affected it, s/kademlia's extension is about querying disjoint paths (no change to alpha), see 4.4 in http://www.spovnet.de/files/publications/SKademlia2007.pdf