New maps of General Assembly districts that reflect the past decade’s population changes in Pennsylvania survived legal challenges Wednesday when the state Supreme Court unanimously cleared the way for candidates to begin circulating petitions to get on the spring primary ballot. The justices rejected various challenges to the district lines drawn up by the Legislative Reapportionment Commission. As a result, the new state House and Senate districts will be in effect for the coming decade. The justices modified the elections calendar, letting candidates begin to collect signatures starting Friday and lasting 10 days, until March 28. The primary election is May 17.