MILAN (Reuters) - A Milan judge has formally charged Parmalat founder Calisto Tanzi, 15 other executives and three financial institutions over their role in the scandal that plunged one of Italy's best-known brands into insolvency. ADVERTISEMENT Judge Cesare Tacconi sent the executives to trial on Saturday, after eight months of preliminary hearings, on charges including market-rigging, false auditing and of hindering the work of regulators. The Italian offices of Bank of America, auditors Deloitte & Touche and the former Italian affiliate of Grant Thornton were also charged with helping dairy group Parmalat mislead investors. Under Italian law, companies can stand...