Children’s show “Caillou” is officially dead. And parents are dancing on the “little brat’s” grave. “We’re saying farewell to @cailloudhx,” PBS Kids announced in a tweet along with tips “for what to do when your child’s favorite media goes away.” But it seems the bald cartoon character was the least-favorite animated star among moms and dads everywhere, who have been celebrating online since the news of the show’s cancellation broke. “Caillou’s reign of terror is over!!” wrote one relieved viewer on Twitter, while other Caillou-skeptics’ complaints have included that the tot is a bootleg Charlie Brown, called him a “little...