KINGSTON, Jamaica — The documentary ‘Bam Bam: The Sister Nancy Story’ has been selected for the gala screening at the upcoming Trinidad and Tobago Film Festival in September. The film celebrates the life and legacy of Jamaican dancehall pioneer, Sister Nancy, whose 1982 hit ‘Bam Bam’ has become one of the most sampled reggae tracks of all time. Directed by award-winning filmmaker Alison Duke, ‘Bam Bam: The Sister Nancy Story’…