Arun Shourie"I shall travel back with him," says Nawaz Sharif one day on taking the bus to Delhi with the Indian Prime Minister. "We will solve half the problems on the way back." Four days have not passed, and Pakistan observes "Solidarity-with-Kashmir Day." All the usual venom is spewed forth again. What is one to make of these signals?Look at the same thing from Pakistan's point of view. Bal