KHARTOUM, Nov 18 (Reuters) - Two Sudanese journalists have been convicted of publishing an article criticising security services for detaining four other journalists, their colleagues said on Sunday. Al-Fatih Mahjoub Irwaha, editor in chief of Arabic daily Al-Sudani, and his deputy and columnist Nurelden Madini, are facing two months in prison after refusing to pay a fine for defamation, staff at...