For decades, investment bankers have held the key to untold riches -- but now they're being laid off by the tens of thousands. As the crisis forces the industry to search for a new identity, is it ready to mend its ways? The suicide victims chose a location with symbolic significance. Last fall, only a few weeks apart, a businesswoman and a banker went to the Coq d'Argent, an upscale restaurant and hot spot in the world of London high finance, located on the top floor of a shopping complex, to end their lives. The woman put down her purse...