Guy Lodge Film CriticPortugal’s colonial past in Africa continues to haunt some of the country’s most vital and subversive filmmakers. With his remarkable second feature “Tommy Guns,” Angolan-Portuguese director Carlos Conceição’s steps into the same precarious territory sometimes occupied by Pedro Costa and Miguel Gomes — borrowing, perhaps, a measure of the former’s visceral austerity and the latter’s shape-shifting playfulness, but mostly proving his own sly, supple talent.