Consolidate use of pingAll into keepAlivePeers. Add bool operators for Node and NodeIPEndpoint population. NodeTable returns Node instead of NodeEntry (subject to change). Begin transition from NodeInfo to NodeTable Node.

peer.cpp

@@ -55,7 +55,7 @@ int peerTest(int argc, char** argv)
 	{
 		this_thread::sleep_for(chrono::milliseconds(100));
 		if (!(i % 10))
-			ph.pingAll();
+			ph.keepAlivePeers();
 	}
 
 	return 0;