func (l *logger) Verbosef(format string, vals ...interface{}) {
	l.mut.Lock()
	defer l.mut.Unlock()
	s := fmt.Sprintf(format, vals...)
	l.logger.Output(2, "VERBOSE: "+s)
	l.callHandlers(LevelVerbose, s)
}
func (l *logger) Verbosef(format string, vals ...interface{}) {
	l.mut.Lock()
	defer l.mut.Unlock()
	s := fmt.Sprintf(format, vals...)
	l.logger.Output(2, "VERBOSE: "+s)
	l.callHandlers(LevelVerbose, s)
}
// Infof logs a formatted line with a VERBOSE prefix.