BofA Merrill Lynch lays out a bullish vision for 2013, and it includes much to tantalize investors: S&P to 1,600, gold pushing as high as $2,400/oz., and an accelerating housing recovery. The year ahead can be divided into two halves: The first, in which growth will be slow due partly to Spain's debt and residual effects of the fiscal cliff, and the second when those issues are resolved and growth accelerates.