Energy North placed a winning bid of $9.27 million, plus the value of the stores’ inventory to acquire M.W. Sewall’s 11 Clipper Mart stores, outbidding Cumberland Farms Inc.’s $8.5 million offer, The Times Record reported.  Other qualified bidders at Tuesday’s auction included H.A. Mapes Inc., Mac’s Convenience Stores LLC and TD Bank. Two other qualified…