Method time_since_last_assigned

plugins/autolabor/labormanager.cpp:135–138

    void set_maximum_dwarfs(int maximum_dwarfs) { config.ival(2) = maximum_dwarfs; }

    int time_since_last_assigned() const
    {
        return (*df::global::cur_year - config.ival(3)) * 403200 + *df::global::cur_year_tick - config.ival(4);
    }

    void mark_assigned() {
        config.ival(3) = (*df::global::cur_year);