BP and other companies sued over the massive Gulf oil spill are asking a federal judge to dismiss many of the claims filed by businesses and people who say they have been harmed by the disaster .U.S. District Judge Carl Barbier set Monday as a deadline for BP, Transocean and other companies to file motions to dismiss claims over last year's deadly Deepwater Horizon rig explosion and the spill that followed it.Rig owner Transocean says many plaintiffs' claims should be dismissed because they allegedly failed to follow the terms of the Oil Pollution Act of 1990 and filed suit before properly presenting their claims to BP…