BOSTON (Reuters) - Former crime boss James "Whitey" Bulger is scheduled to be formally arraigned on Wednesday on charges that he killed 19 people, and his lawyers are preparing for what is expected to be a long, grueling and complex case. After 16 years on the run as one of America's most wanted criminals, Bulger, 81, will make his fourth visit to Boston's federal court house since being returned in late June to the city he terrorized as a mobster and later...