I’m filled with terrible apprehension when I think of “Battlestar Galactica” resuming new episodes in January: I really don’t want Laura Roslin to die. But I’m not sure I want her to live, either.By thrusting not only a woman, but a woman dying of breast cancer, into the presidency of the Twelve Colonies, Ron Moore created a powerful dramatic character, indeed. President Roslin has had to simultaneously deal with the mortality not only of the human race but her own.Actress Mary McDonnell has given the character such vibrancy that she commands nearly every scene in which she appears. (Geena Davis, eat your heart out!)Although she appeared in no way, shape, or form in the original 1970s series, Laura Roslin easily has become my favorite “Battlestar” character.Through the series’ first year, …