ISTANBUL (Reuters) - The Turkish government approved on Thursday a list of pro-Kurdish politicians to visit jailed militant leader Abdullah Ocalan, a justice ministry official said, a long-awaited step to advance peace talks on ending a 28-year-old insurgency. Turkey launched tentative negotiations with Kurdistan Workers Party (PKK) leader Ocalan in his jail on Imrali island near Istanbul in October, drawing up a framework to end a conflict which has killed more than 40,000 people. But there has been little sign of progress since two Kurdish politicians met Ocalan on January 3. ...