SANAA, Feb 22 (Reuters) - A Yemeni editor on trial for reprinting cartoons of the Prophet Mohammed said he had done so to show Muslims how insulting they were, not to deride Islam. Now Mohammad al-Asaadi, editor-in-chief of the English daily Yemen Observer, says Islamists could kill him for his action. "The problem now is not the trial," he told Reuters on Wednesday from a cage in a Sanaa...