DOCUMENTARY PREMIERE: From today through all of June, local PBS member stations can opt to show the TV premiere of An Accidental Studio, which would generate a lot more initial enthusiasm had it included George Harrison in its title. That’s because the studio in question is Handmade Films, which the former Beatle formed simply so he could rescue, finance, distribute and, most of all, watch a movie in the works from his friends at Monty Python’s Flying Circus. The first rele