NEW DELHI - Justice Amitava Roy was Friday sworn in as a judge of the Supreme Court. With the elevation of Roy, who was chief justice of the Orissa High Court, the strength of the apex court has gone up to 29 against a sanctioned strength of 31 judges. Justice Roy will have a tenure of three years. Coming from a family of lawyers and judges from Kolkata, Justice Roy, born March 1, 1953,