By Stephen Brown BERLIN (Reuters) - Qatar's ruler Emir Sheikh Tamim bin Hamad Al Thani assured the West on Wednesday that it was **t aiding Islamic State in Iraq and Syria, telling Germany that his own country's security was jeopardised by the militants. Last month, a German cabinet minister accused Qatar of financing Islamic State militants and the United States has expressed concern about funding from Arab states, although Qatar has **w promised to support U.S.-led efforts to combat IS. ...