BOSTON Team-based hedge funds lost billions in cash and some of their cachet this year, creating an uncertain future for a strategy that had long been an industry darling. Since January, investors pulled some $7 billion (5.67 billion pounds) in assets from so-called multi-manager funds, data from research firm eVestment show. This marks a sharp reversal for a strategy whose promises of diversified strategies and strong returns drew in $56 billion in new cash in 2015. This year's outflows are already the biggest since the financial crisis and more could come in December, often the month investors make their biggest...