* In three days, navy says 5,200 rescued
* Merchant ships, Maltese vessel also involved in rescues
* Sicilian mayor says: "Europe can't turn its back"
By Steve Scherer
ROME, June 8 (Reuters) - Italy has rescued about 5,200 men, women and children and recovered three dead bodies from overcrowded boats in the Mediterranean Sea since early Thursday.
Calm seas have led to this latest...