Behind a tall perimeter wall, studded with surveillance cameras and guarded by Moroccan soldiers, a sprawling new palace for King Salman of Saudi Arabia rose on the Atlantic coast here last summer. Even as the Saudi government canceled a quarter of a trillion dollars’ worth of projects back home as part of a fiscal austerity program, workers hustled to finish bright blue landing pads for helicopters at the vacation compound and to erect a tent the size of a circus big-top where the king could feast and entertain his enormous retinue. The royal family’s fortune derives from the reserves of petroleum discovered during the reign of Salman’s father, King Abdulaziz ibn Saud, more than 75 years ago. The sale of oil provides billions of dollars in annual allowances, public-sector sinecures and perks for royals, the wealthiest of whom own French chateaus and Saudi palaces, stash money […]