By Nelson Acosta HAVANA (Reuters) – The Colombian government and left-wing FARC rebels ended a 15th round of peace negotiations on Sunday trading accusation over responsibility for the slow pace of the talks and for the first time failing to issue a joint statement on their progress. Polls in Colombia show the population is tiring of the talks, which have dragged on for 11 months with only a partial accord on agrarian reform, the first point of a six-point agenda. …
