Method update

code/basic/progress.cpp:120–130

void ProgressLogger::update() {
	std::size_t percent = cur_val_ * 100 / ogf_max<std::size_t>(1, max_val_-1) ;
	
	if(percent != cur_percent_) {
		cur_percent_ = percent ;

		if(!quiet_) {
			Progress::instance()->notify(ogf_min<std::size_t>(cur_percent_, 100)) ;
		}
	}
}