The Cleaver family - June, Wally and the Beaver - have moved to a new neighborhood. "The New Leave It to Beaver," now in its fourth season on Ted Turner's TBS network, set up shop Friday at Universal Studios Florida to become the first show to go into production at the new 440-acre studio in Orlando. "It's almost like we're born again," said Jerry Mathers, who is still playing Beaver at 40. "We're born-again Cleavers." To make it official, the other stars, Tony Dow and Barbara Billingsley, joined Mathers in nailing the address numbers "211" on the door frame of their new television home. The show was previously taped in California.