Fix METADAPT-A transaction IDs not starting at 1/-1

metadapta.go

@@ -37,6 +37,11 @@ func AdaptA(underlying net.Conn, party Party) Conn {
 		transChan:  make(chan *transA),
 		done:       make(chan struct { }),
 	}
+	if party == ClientSide {
+		conn.transID =  1
+	} else {
+		conn.transID = -1
+	}
 	go conn.receive()
 	return conn
 }