By Nicolas Bertin PARIS (Reuters) - A French soldier patrolling a business neighborhood west of Paris was stabbed in the neck and injured on Saturday by a man who fled the scene and is being sought by police, President Francois Hollande said. The 23-year-old was patrolling in uniform with two other soldiers as part of France's Vigipirate anti-terror surveillance plan when he was approached from behind around 6 p.m. and attacked with a knife or a box-cutter. ...