Truffle/Source Attribution: Replace direct creation of SourceSection objects with factory methods on Source; two of these greatly simplify source attribution by automatically computing either the row/column start location from a character offset or vice versa, depending on what?s made available from the parser. Minor API change on Visualizer.

public class T
{
  public static boolean foo(boolean bar)
  {
    return bar;
  }

  public static void printIt()
  {
    System.out.println("Hello");
  }
}