NEW YORK, April 28 (Reuters) – Economically delicate locations of the U.S. stock market place are flashing warnings over development, even as key equity indexes edge bigger. The S&P 500 is up 8.6{21df340e03e388cc75c411746d1a214f72c176b221768b7ada42b4d751988996} for the year following gaining 1.5{21df340e03e388cc75c411746d1a214f72c176b221768b7ada42b4d751988996} in April, many thanks to roaring calendar year-to-date rallies in shares […]