As North Korean leader Kim Jong Un threatened Seoul and vowed to continue expanding his sanctioned nuclear weapons programme at the party congress, the big question was whether his 13-year-old daughter would be anointed as his heir. That news, or any unquestionable indication of it, didn't materialise this week. But it has launched a debate about the young Kim Ju Ae's viability as the next leader for the country of 25 million - a dictatorship which has only ever been ruled by a member of the