Oil prices were little changed on Tuesday as OPEC stuck by its forecast for demand growth this year and next, amid persistent tensions in the Middle East and beyond. Brent futures for May delivery were up 24 cents at $82.45 a barrel by 1420 GMT. The April US West Texas Intermediate (WTI) crude contract rose 31 cents at $78.24. On Tuesday, OPEC stuck to its forecast for relatively strong grow