glog.go
func (l *Log) SetAlsoLogToStderr(f bool) {
	l.mu.Lock()
	defer l.mu.Unlock()
	l.alsoToStderr = f

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

}
// SetAlsoLogToStderr sets the flag that, if true, logs to standard error as well as files