Neither this chapter nor anything herein contained shall be construed as a restriction or limitation upon any powers which a municipality might otherwise have under laws of this state nor to limit or change the provisions of Sections 57-1-1 through 57-1-51, but shall be construed as cumulative; nor shall the bonds issued hereunder be affected by or counted in connection with any statutory limitation upon the amount of bonds which otherwise may be issued by such municipality. The bonds herein authorized may be issued in addition to any bonds issued under Sections 57-1-1 through 57-1-51, and without regard to the amount of any other bonds issued or outstanding.