The Peabody Essex Museum in Salem Massachusetts has a new home designed by Moshe Safdie, writes Robert Campbell, and it’s a winner. The old museum “was a hodgepodge of buildings and additions that accreted over more than a century and a half. With the new addition – and the dozen or more historic houses in Salem owned by the museum – PEM now has, according to its director, Dan Monroe, 88 percent as much floor area as the Boston Museum of Fine Arts. A local provincial museum has morphed into a potential national icon. It’s not easy to fit so big a museum into the modest surroundings of historic Salem. On the whole, Safdie pulls it off.