Monday, 5 May 2014 - 21:22 By Rogerio Jelmayer SÃO PAULO--Despite the collapse of his fortune and some of his companies, Brazilian businessman Eike Batista has returned to Brazil's main stock-market index, thanks to the modest resurgence of his mining company. Mr. Batista's MMX Mineração e Metálicos SA joined the Ibovespa index Monday, and will remain there a..