By Philip Pullella VATICAN CITY (Reuters) – The Vatican on Tuesday unveiled a committee to oversee the ethics of its investments, even as a corruption trial related to a botched London real estate deal in which it lost more than 200 millions euros continued. The committee will be headed by a cardinal, Irish-American Kevin Joseph Farrell, who is based at the Vatican, but include four outside lay financial experts, a statement said. They are Jean Pierre Casey of RegHedge investments in Britain, Giovanni Christian Michael Gay of Union Investment Privatfonds GmbH in Germany, David Harris of Skagen…