Stocks opened solidly higher Thursday thanks to a round of encouraging economic data and strong earnings from memory chipmaker Micron Technology (MU). And while the major indexes lost steam as the session wore on, one of the benchmarks managed to end at a new record close.  Investors had plenty of headlines to sift through today. On the economic front, the final reading on second-quarter gross domestic product (GDP) showed the economy grew at an annual rate of 3% over the three-month period, according to th ...