TEHRAN — The smiling started early in Tehran on Sunday, when President Hassan Rouhani kissed a young schoolgirl in an Islamic head scarf before dozens of cameras, signaling that Iran’s future had taken a new turn. After years of seemingly endless bad tidings of more international sanctions, more inflation and more saber rattling, many in this capital received the news of the first nuclear agreement between Iran and world powers in more than a decade like an awakening from a bad dream, and they shared their emotions on social media. “When I checked my Instagram when I woke up, someone had posted a picture of an Iranian and American flag,” said Asal Khalilpour, 29. “After I read the comments saying a deal was made, tears started rolling down my cheeks of happiness. I couldn’t believe it.” People from across the Iranian political spectrum, including many hard-line commanders and clerics […]