Most of us think pro surfing began in 1976, when the IPS jumped off Randy Rarick’s kitchen table and took its first wobbly steps into the world. Or maybe a few years earlier, with the debut Smirnoff Pro-Am. But pro surfing goes further back. Jantzen paid Ricky Grigg $2,000 in 1964 to wear their not-very-surfy gear. New world champ…