LONDON – Attention-shy writer Dan Brown completed three days of tough courtroom scrutiny yesterday, acknowledging he reworked other writers’ material but rejecting claims he copied two authors’ work for his mega-selling thriller “The Da Vinci Code.” Appearing as a witness for publisher Random House, Brown appeared increasingly tired during lengthy cross-examination that dwelled on the details of his research process and minutiae such as whether the word “savior” should be spelled with a u. Writers Michael Baigent and Richard Leigh are suing Random House, Brown’s publisher, for copyright infringement at London’s High Court, claiming “The Da Vinci Code” “appropriated the...