func (l *Log) SetLogToStderr(f bool) {
	l.mu.Lock()
	defer l.mu.Unlock()
	l.toStderr = f

}
func (l *Log) SetLogToStderr(f bool) {
	l.mu.Lock()
	defer l.mu.Unlock()
	l.toStderr = f

}
// SetLogToStderr sets the flag that, if true, logs to standard error instead of files