Forget blowing the images up to IMAX size and converting the lunging velociraptors and T. Rexes into 3-D. The best reason to revive ???Jurassic Park??? for its 20th anniversary is Jeff Goldblum. (The film opens Friday in area theaters.)Yes, children, there was a time when Goldblum was sci-fi???s ???ultimate explainer,??? as producer Dean Devlin labeled him in ???Independence Day.??? Goldblum???s b