Warren Buffett may be saying goodbye to a chunk of his Bank of America Corp BAC shares, but the charts signal a strong outlook for the stock. With the stock up 23.75% year-to-date and a solid 55.43% over the past year, BAC stock is still riding a bullish wave, even as Buffett's Berkshire Hathaway Inc BRK BRK quietly steps back.Buffett's Selloff: Timing Or Trend?In a move that has raised some eyebrows, Buffett's Berkshire Hathaway sold off 9.5 million shares of Bank of America over just three days last week ...