Now we have 3 more logically divided interfaces for the listener
pattern (callbacks).
A P2PNetInterface for peers maintainance.
A DataListenerInterface for the sections getting new data.
And last the new HeaderSyncInterface about the state of the
header-chain (application wide).
We reuse the NetworkManager lower level code in order to connect
to the Bitcoin P2P network.
This implements the basics for anyone wanting to be a player on
this network.
tomFlowee
TomZ