HONG KONG (Reuters) - Activist investor Elliott Management Corp has begun new legal proceedings against Bank of East Asia (BEA) <0023.HK> over a share placement, escalating a long-running dispute between the New York-based hedge fund and the tycoon-owned Hong Kong bank.Elliott, which has a 7 percent stake in BEA, said on Monday it has filed a lawsuit in the Hong Kong court against the bank, the majority of the bank's directors, its CEO and chairman.In a statement, Elliott cited "allegations of unfairly prejudicial conduct" and "alleged serious corporate governance failings" in relation to last year's issue of new shares to...