PARIS, Nov 16 (Reuters) - French Interior Minister and presidential hopeful Nicolas Sarkozy received a boost on Wednesday from an opinion poll showing strong approval for his handling of almost three weeks of urban unrest, now on the wane. The survey put Sarkozy ahead of Prime Minister Dominique de Villepin, likely to be his main rival for the presidency in 2007, and showed both had come through France's worst civil unrest in almost 40 years much better than expected. Youngsters angered by a lack of jobs and opportunities in poor suburbs protested for the 20th successive night, but police said...