EVOLUTION to some, dilution to others... This is what the new, car-based, part-time all-wheel drive Compass represents as far as the hitherto hardcore 4x4 Jeep brand is concerned. The Americans want plenty of that compact SUV action, and they believe that buyers of such vehicles will respond to the outdoorsy reputation of the marque more readily as a result. Does Compass rock the Toyota RAV4 and rattle the Nissan X-Trail, or will it merely undermine 66 years of hard-won Jeep values?