void ScriptConfig::AddRandomDeviation()
{
	for (ScriptConfigItemList::const_iterator it = this->GetConfigList()->begin(); it != this->GetConfigList()->end(); it++) {
		/* start_date = 0 is a special case, where random deviation does not occur. */
		if ((*it).random_deviation != 0 || typeid(*this) == typeid(AIConfig) && StrEmpty((*it).description) && strcmp((*it).name, "start_date") == 0 && this->GetSetting((*it).name) != 0) {
			this->SetSetting((*it).name, InteractiveRandomRange((*it).random_deviation * 2) - (*it).random_deviation + this->GetSetting((*it).name));
		}
	}
}