Those worried that Quentin Tarantino is treading uncouth territory with regards to the Manson murders in his next film may be encouraged by new plot details that have emerged. Once Upon a Time in Hollywood takes place in 1969 in, as the title suggests, Los Angeles. The story's focus is on the changing landscape at the time, when Hollywood’s Golden Age gave way to the rise of television and and increasingly bold creative expression, but one particular aspect of movie has garnered plenty of interest: Margot Robbie’s role as Sharon Tate. Tate, a famous actress, was brutally …