Libya intends to reopen its oil sector to new foreign investments, its state-run oil company’s chief said Tuesday, a move that would give oil companies the opportunity to develop the largest petroleum reserves in Africa for the first time in five years. Libya froze all new foreign investment in 2011 after the civil war that toppled strongman Moammar Gadhafi. International oil companies such as Total SA of France and ConocoPhillips have long had operations in Libya, and Eni SpA of Italy has found ways to keep…