Section 6. Laws from time to time in force relating particularly to any city or town shall prevail where they are in conflict with the provisions of chapters fifty-one to fifty-seven, inclusive; but, except as otherwise provided by any such law, said chapters and all other statutes in any way concerning the right to vote at primaries, caucuses or elections, or its exercise, or matters incidental thereto, shall apply to such city or town, in addition to the laws particularly applicable thereto.