By THÉRÈSE MARGOLIS     Historically, the lush South American country of Colombia has been a mixed bag of triumphs and tragedies. Once home to the highly organized Muisca Confederation and the ultra-sophisticated Quimbaya Civilization (known for its spectacularly detailed gilt masterpieces), the early Spanish conquistadors believed Colombia enshrouded the illusive El Dorado city of gold. Named after Christopher Columbus – even