Let suture logging bubble upwards

internal/model/model.go

@@ -107,13 +107,7 @@ var (
 // for file data without altering the local folder in any way.
 func NewModel(cfg *config.Wrapper, id protocol.DeviceID, deviceName, clientName, clientVersion string, ldb *leveldb.DB) *Model {
 	m := &Model{
-		Supervisor: suture.New("model", suture.Spec{
-			Log: func(line string) {
-				if debug {
-					l.Debugln(line)
-				}
-			},
-		}),
+		Supervisor:         suture.NewSimple("model"),
 		cfg:                cfg,
 		db:                 ldb,
 		finder:             db.NewBlockFinder(ldb, cfg),