Outside, the temperature hovered barely above 20 Fahrenheit, but in the warm and crowded council chamber, new Statesboro Mayor Jonathan McCollar called for unity immediately after being sworn in. His first meeting was not entirely a paragon of unanimity, with the council voting 2-3 and then 3-2 on the choice of a broker for the city’s employee health insurance services after contentious discussion. But the members were unanimous on a compromise offer to the Bulloch County government on shares of revenue from a proposed sales tax for transportation projects, and on all other votes at Tuesday’s 9 a.m. meeting.