LONDON -- Marianne Faithfull has postponed a world tour after being diagnosed with breast cancer, her London publicist said Thursday. Doctors in France, where Faithfull was diagnosed, say the cancer is in its earliest stages, said publicist Rob Partridge. Faithfull, 59, had been due to begin a world tour next month, but it has been postponed until next year. "I have absolute faith and confidence in my fantastic medical team and of course I will be well again, if not better than ever," the British singer-actress said in a statement released by Partridge. "Next year's tour, I want to assure...