Photo illustrations by Hitesh Sonar Now in its ninth year, Bloomberg’s New Economy Forum brings together global leaders to discuss crucial issues in business and politics. To mark this year’s event, Oct. 13-15 in Delhi, Businessweek is taking a close look at India, from its experience with weight-loss drugs to the future of transportation How do you count 1.4 billion people? Or is it 1.3 billion? 1.5 billion? For the first time in a decade and a half, India is conducting a census. …