* Commission recommends fund should become separate entity * Also recommends reforms of central bank's management * Final decision to be made by parliament (Adds quotes, background, detail, bullets) OSLO, June 23 Norway's $960 billion wealth fund, the world's largest, should be split from the country's central bank, which has managed the fund since its launch in 1996, a government-appointed commission said on Friday. Norwegians have built up the fund with revenues from the country's vast...