Canada greets 'Karla' with outrage By ANNE NEVILLE NEWS STAFF REPORTER 1/21/2006 Laura Prepon has the title role in "Karla," a film that will open in the Buffalo area later this year. Karla Homolka served 12 years in prison and was released last summer amid a storm of public opposition. For Western New Yorkers who remember the early 1990s Ontario sex slayings by Paul Bernardo and Karla Homolka, the movie "Karla" may shed light on the psyche of an unlikely and vicious killer. But Michael Sellers, the film's Los Angeles-based producer and writer, is finding that people in Ontario are...