Michael O’Leary has given up the attention-grabbing stunts and outrageous proposals that used to ensure headlines for him and his airline, Ryanair. No more badmouthing customers, suggesting standing-only tickets or fees for using the toilet on planes, and dressing up as a court jester or a leprechaun. Now that Ryanair is Europe’s biggest carrier—one in five flights on the continent comes courtesy of its 550 aircraft—the demands to…