One solace for bulls after the worst first half for U.S. stocks in five years: every strategist on Wall Street sees the Standard & Poor’s 500 Index rising. Prospects for higher interest rates and Greece’s travails have frozen a market that rose 47 percent between 2011 and 2013. Professional stock forecasters remain bullish, saying the economy is too strong for the second-longest U.S. rally since 1950 to end now.