Build roads, electrify villages, clean up the holy river Ganges: for the past 70 years, successive governments in India have stuck with virtually identical to-do lists for the country’s development. Now, a new item seems to have cropped up on the political agenda: make people happy. In July, the central Indian state of Madhya Pradesh announced it would open a ministry of happiness, and start a string of happiness-inducing programmes including yoga, arts, and free…