Top judge Katerina Sakellaropoulou on Wednesday became Greece’s first woman president when lawmakers elected her head of state in a rare display of unity.The conservative party nominee was backed by opposition parties, including the leftist Syriza party which lost power in an election last July. She was backed by 261 MPs in the 300-member parliament.Sakellaropoulou will take over from Prokopios Pavlopoulos, whose five-year term ends in March.“The time has come for Greece to open up to the…