Dusan/register osob

Otoc poradie ifov. Najprv ten so `student = True`, potom ten s absolvent a student a nakoniec ten so vsetkymi troma.

Cize napr. ked plati `fakulta and studijny_program and any(rocniky) and not (absolvent or student or zamestnanec)`, chceme selectnut iba studenta.