The warm and personable director behind such seminal films as “A Christmas Story” and “Porky’s,” Bob Clark masterfully combined warm sentiment with a sharp edge. What other sex romp had such a sense of innocence; what other holiday classic conjured up such a vivid image of the f-word without actually uttering the phrase? Clark started in low-budget horror films, and was also credited with jump-starting the slasher movie craze with his darkly comic, “Black Christmas” – his other less-than-jolly yuletide movie. While later efforts like “Baby Geniuses” failed to live up to his earlier output,