config& save_index::save_summary(std::string save)
{
        /*
         * All saves are .gz files now so make sure we use that name when opening
         * a file. If not some parts of the code use the name with and some parts
         * without the .gz suffix.
         */
        if(save.length() < 3 || save.substr(save.length() - 3) != ".gz") {
                save += ".gz";
        }

        config& cfg = load();
        if (config &sv = cfg.find_child("save", "save", save))
                return sv;

        config &res = cfg.add_child("save");
        res["save"] = save;
        return res;
}