fixing various compilation errors

src/node.cpp

@@ -33,6 +33,7 @@ constexpr std::chrono::minutes Node::NODE_GOOD_TIME;
 constexpr std::chrono::seconds Node::MAX_RESPONSE_TIME;
 
 /* This is our definition of a known-good node. */
+bool
 Node::isGood(time_point now) const
 {
     return
@@ -81,4 +82,10 @@ Node::received(time_point now, bool answer)
     }
 }
 
+std::ostream& operator<< (std::ostream& s, const Node& h)
+{
+    s << h.id << " " << print_addr(h.ss, h.sslen);
+    return s;
+}
+
 }