(This is part one of a two-part series. Part two will publish on Tuesday.)Wayne W. McFarland Jr.’s equitable contribution claim against Z. David Patterson earned two opinions from U.S. District Judge Robert W. Gettleman.One focused on whether they shared a “joint financial obligation” — based on signing separate guaranties for the same debt — and another on the effect of a subsequent “contribution agreement.”McFarland, Patterson and Bruce Paul guaranteed a $1.75 million loan to …