By Stephanie Nebehay and John O’Donnell BELLINZONA, Switzerland (Reuters) – Credit Suisse learned of murders and cocaine smuggling allegedly connected to a Bulgarian gang but continued to manage cash that is now the focus of a criminal trial, a banker accused of money laundering told a Swiss court during the case. In the first criminal trial of a major bank in Switzerland, Credit Suisse and one of its former employees face charges of allowing an alleged Bulgarian cocaine trafficking gang to launder millions of euros, some of it in used banknotes stuffed into suitcases. The bank and the accused…