Kentucky coach John Calipari and his staff received Nerlens Noel’s letter-of-intent Thursday. The team’s fourth signee is a 6-foot-10 forward and played for Tilton (N.H.) last season and is slated to be the Wildcats’ inside replacement for Anthony Davis, who declared for the NBA Draft earlier this week. Noel averaged 12.6 points, 7.2 rebounds and …