Sections 31-15-1 through 31-15-19, without reference to any other statute, shall be deemed full and complete authority for the issuance of refunding bonds by political subdivisions of the state, and shall be construed as an additional and alternative method therefor. None of the present restrictions, requirements, conditions, or limitations of law applicable to the issuance of bonds by political subdivisions of this state shall apply to the issuance and sale or exchange of bonds under the aforesaid sections, and no proceedings shall be required for the issuance of such bonds other than those provided for and required herein. All powers necessary to be exercised by the governing authority of any such political subdivision in order to carry out the provisions of said sections are hereby conferred.