Jason Voorhees is still unstoppable. It was a bloodbath at the weekend box office when the remake of the 1980 horror movie “Friday the 13th” slashed its way to No. 1, earning $42.5 million in its first weekend in theaters, more than double the total of the No. 2 movie, “He’s Just Not That Into You.” Both are Warner Brothers pictures, though, so it was a lucrative weekend for the company. “He’s Just Not That Into You,” the romantic comedy with an ensemble cast including Ginnifer Goodwin and Bradley Cooper, made $20.3 million in it second week, for a total of $55.8 million to date, according to the box office tracking firm Media by Numbers. The action movie “Taken” (20th Century Fox), starring Liam Neeson, fell from second place to third, earning $19.3 million (for a total of $77.9 million to date). The new comedy “Confessions of a Shopaholic” (Disney), starring Isla Fisher, came in fourth with $15.4 million, and “Coraline” (Focus), the 3D animated feature based on a novel by Neil Gaiman, placed fifth with $15.3 million in its second week, up to $35.6 million to date.