Section 119-M. Legislative intent

The  provisions  of  this article are
  designed to effectuate in part (1) section two-a of article eight of the
  constitution and (2) section one of article eight of the constitution as
  amended January first, nineteen hundred sixty, and shall be in  addition
  to   and  not  in  substitution  for  or  in  limitation  of  any  other
  authorization for performance by municipal corporations or districts  of
  their  functions,  powers  or duties on a cooperative, joint or contract
  basis.