More detail and output improvements to command bus "listpeers," and a little cleanup.

node/Peer.hpp

@@ -347,6 +347,19 @@ public:
 		_vRevision = vrev;
 	}
 
+	/**
+	 * @return Remote version in string form or '?' if unknown
+	 */
+	inline std::string remoteVersion() const
+	{
+		if ((_vMajor)||(_vMinor)||(_vRevision)) {
+			char tmp[32];
+			sprintf(tmp,"%u.%u.%u",_vMajor,_vMinor,_vRevision);
+			return std::string(tmp);
+		}
+		return std::string("?");
+	}
+
 	/**
 	 * Get and reset dirty flag
 	 *