BEIRUT (Reuters) - Veteran fighters of last year's civil war in Libya have come to the front-line in Syria, helping to train and organize rebels under conditions far more dire than those in the battle against Muammar Gaddafi, a Libyan-Irish fighter has told Reuters. Hussam Najjar hails from Dublin, has a Libyan father and Irish mother and goes by the name of Sam. A trained sniper, he was part of t