Rebel forces in Libya have clashed with troops loyal to Col Muammar Gaddafi about 80km (50 miles) south-west of the capital, Tripoli. A rebel spokesman in the Nafusa mountains said there had been heavy fighting on the outskirts of the strategic town of Bir al-Ghanam. The rebels told the BBC they were making a push for Tripoli. Meanwhile, Col Gaddafi has agreed to stay out of talks aimed at ending the conflict, African leaders said. In a communique after talks on Sunday in South Africa, the African Union panel on Libya said it welcomed “Col Gaddafi’s acceptance of not being part of the negotiations process”. The statement did not elaborate….