BOGOTA (Reuters) -Colombian prosecutors will take ex-President Alvaro Uribe to trial in a witness tampering and fraud case, the attorney general's office said on Tuesday, saying it has presented a written accusation against the former head of state to the Supreme Court. Uribe and several allies have been investigated over allegations of witness tampering carried out in an attempt to discredit accusations he had ties to right-wing paramilitaries. The development is the latest update in a long-run