Section 6. (1) A partnership is an association of two or more persons to carry on as co-owners a business for profit and includes, for all purposes of the laws of the commonwealth, a registered limited liability partnership.
(2) But any association formed under any other statute of this state, or any statute adopted by authority, other than the authority of this state, is not a partnership under this chapter, unless such association would have been a partnership in this state prior to January first, nineteen hundred and twenty-three; but this chapter shall apply to limited partnerships except in so far as the statutes relating to such partnerships are inconsistent herewith.