By Frank Hartzell CEO of Wall Street giant tells Jim Cramer the company has to do a better job explaining its goals to investors. Once called “Golden Slacks” by Jim Cramer, the leading Wall Street investment bank is a different company today than the one so famous for enriching its principals. David Solomon, chairman and CEO of Goldman Sachs (GS) – Get Goldman Sachs Group, Inc. Report, talked with Cramer on a recent episode of the Mad Money TV show. Shares have lagged its peers and now trade with some of the lowest price to earnings ratios in the S&P 500. Solomon explained that the company’s k…