It’s too soon to declare the helicopter parent is dead. But the author of a bestselling new parenting book, “Bringing Up Bebe: One American Mother Discovers the Wisdom of French Parenting,’’ and other experts, report a growing eagerness among mothers and fathers to return to the less-intense style practiced by previous generations. It’s a loose movement, if it can even be called that, known as “free-range parenting,’’ that aims for common-sense parenting in an overprotective world.