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‘Tis the season for the pumpkin spice latte, or PSL, for short. Starbucks, Panera, Krispy Kreme and a slew of other chains and local coffee shops are serving up the fall favorite. And it’s got a cult following. Just how popular is the orange gourd? Pumpkin-flavored products — from muffins to pancakes to lattes — bring in $500 million a year. While “skipping the Starbucks” and other seasonal…