Photo: Marcus Patterson No matter how accomplished, anthology movies can often be exhausting to watch. For those brief hours in its presence, a film demands total immersion, and switching from one story to another can start to feel like taking a long trip that requires hopping between cars and trains and boats and planes. By the end, all you want is for the ordeal to be over. So, what a wonder it is to discover Sierra Falconer’s Sunfish (& Other Stories on Green Lake) , a Sundance premiere