By Alun John and Danilo Masoni MILAN/LONDON (Reuters) -A European recession looked like a no-brainer just a few weeks ago, but that picture has changed dramatically, and investors have started pouring money into the region’s stocks, currency and bonds. Warmer temperatures and well-filled gas storage facilities mean there’s less concern about power shortages and sky-high energy bills. That, along with China reopening its economy at breakneck speed, promises a boost for Europe’s export-oriented economy. Figures on Tuesday on Tuesday showing euro zone business activity made a surprise return to m…