AHMED ELUMAMI A long ceasefire has brought life back to Tripoli's Algeria Square, its roundabout replanted with grass and customers lingering into the night at the Aurora Cafe, but Libya's new crisis of two governments threatens to upend that peace. Home to the city hall, post office and a mosque converted from the colonial-era Italian cathedral, Algeria Square plays a big role in the capital's civic life. But it is also near likely front lines in a battle many Libyans fear may soon erupt. The standoff worsened this week as the parliament in the east swore in a new administration…