CAIRO (Reuters) - Egyptians overwhelmingly approved a new constitution by referendum, state media reported on Thursday, a widely expected outcome that nudges army chief General Abdel Fattah al-Sisi ever closer to a bid for the presidency. The vote advances a transition plan the military-backed government unveiled after deposing Islamist president Mohamed Mursi last July following mass unrest over his rule. The constitution won wide support among the many Egyptians who favored Mursi's removal. The Muslim Brotherhood had called for a boycott, saying the vote was part of a coup that deposed an elected leader and revived a brutal police state....