A phony track worker triggered a terror scare inside a lower Manhattan subway tunnel Friday morning - but he turned out to be a despondent college student who wanted to kill himself by ingesting sodium cyanide, police said. A 20-year-old Pace University student who has been on the school's Dean's List told police he wanted to find a discreet alcove, mix the cyanide pellets with water and ingest it. "He did not want to be found," said Deputy Commissioner Paul Browne, the NYPD's top spokesman. "He had no ID on him. He was looking for some isolated place in the...