Procter & Gamble Co. said Tuesday that it will expand its Gain brand from the laundry to the kitchen sink, the latest move by the world’s largest consumer products company to market its megabrands in new ways and new places. At a Jefferies investor conference in Nantucket, MA, the company also affirmed forecasts on sales and earnings it offered earlier this year. After slipping during the recession, P&G’s revenue is rising again because the company is offering new version...