The 2012 survey of the courageous Chinese artist Ai Weiweiseen at the Hirshhorn Museum in Washington has finally arrived in New York, and is much improved. The show, “Ai Weiwei: According to What?,” which opens Friday at theBrooklyn Museum, has been beefed up throughout, but most notably by two installation pieces completed in 2013. One, “S.A.C.R.E.D.,” […]