Insight: War on Islamist militants tests Tunisia's young democracy

By Patrick Markey and Tarek Amara TUNIS (Reuters) - Four days after Islamist militants shot dead 21 tourists in Tunisia's Bardo museum last year, police rounded up dozens of people suspected of links with the gunmen.    One of the men, a laborer, was arrested in his Tunis home. "I thought I didn't have any other way out."    Several recent cases of police abuse – which the Tunisian government acknowledges still sometimes occurs – underscore the difficult