A federal judge has granted a new trial for former Oconto Falls doctor Isaias Cupino after overturning convictions a jury returned in April on five child pornography charges.Cupino was convicted of three counts of production of child pornography, one count of transportation of child pornography, and one count of possession of child pornography. He was acquitted on three other counts.In a ruling issued Friday, U.S. District Judge William Griesbac…