Kevin Costner is taking another swing at getting a judge to toss a sexual harassment lawsuit filed against him by a stunt performer who claims she was forced to participate in an unscripted and unscheduled rape scene on the set of the Western film series, "Horizon." The judge recently threw out two of Devyn Labella ' s 10 claims ... but Costner just appealed the decision in a bid to get the eight remaining claims dismissed ... according to new legal docs obtained by TMZ. Costner's attorney,