UNITED NATIONS, Sept 26 (Reuters) - The United Nations high commissioner for refugees said on Saturday the world waited far too long to respond to the refugee crisis sparked by the wars in Syria and elsewhere, though rich countries now appear to understand the scale of the problem. "Unfortunately only when the poor enter the halls of the rich, do the rich notice that the poor exist," U.N. refugee chief Antonio Guterres told Reuters in an interview on the sidelines of the annual gathering of world leaders at the U.N. General Assembly. "Until we had this massive movement into Europe,...