I. The provisions of this chapter shall be deemed to provide an additional and alternative method for the effectuation of the purposes of this chapter and shall be construed to be supplemental to, and not in derogation of, powers otherwise conferred by law on municipalities, provided, however, that insofar as the provisions of this chapter are inconsistent with the provisions of any general or special law, administrative order or rule or any limitation imposed by a municipality's charter, the provisions of this chapter shall be controlling.
II. If any provision of this chapter or the application thereof to any person or circumstance is held invalid, the invalidity does not affect other provisions or applications of the chapter which can be given effect without the invalid provisions or application, and to this end the provisions of this chapter are severable.
III. This chapter shall be construed in all respects so as to meet all constitutional requirements. In carrying out the purposes and provisions of this chapter, all steps shall be taken which are necessary to meet constitutional requirements.
IV. This chapter shall be interpreted liberally to effect the purposes set forth in this chapter.