std::list<command>::const_iterator zwrocWskaznikElementListy(std::list<command>& lista, int ktoryEl){
    int pom = 0;
    for( std::list<command>::const_iterator retVal=lista.begin(); retVal != lista.end() && pom<ktoryEl; retVal++ ){
			if(pom++ == ktoryEl)
        return retVal;
    }
}