By Marc Frank HAVANA (Reuters) – The Colombian government and leftist FARC rebels wound up a 13th round of peace negotiations on Wednesday, bickering over how to end the conflict and making little visible progress over key issues despite nine months of talks. While the discussion was supposed to focus on the political participation of Colombia's Revolutionary Armed Forces (FARC), it was overshadowed by a proposed referendum on any deal that was submitted by President Juan Manuel Santos to congress last week and scheduled to occur during national elections next year. …
