While all recent oil exploration attention has been on Exxon's (NYSE:XOM) massive string of discoveries in Guyana, another giant player and a junior explorer are shifting to focus toward what may be the next up-and-coming oil hotspot ... It's Namibia-a country that's never produced a barrel of oil. We don't hear much about new oil discoveries these days. Onshore discoveries are almost unheard of because nearly everything except the African final frontier has been explored. Offshore discoveries are few and far...