code: public boolean add(String srcFilename, int srcLine, int dstLine)
    {
      return add(srcFilename, srcLine, dstLine, false);
    }
docs: Adds a new line map entry.
  
  <p>LineMap assumes that dstLine increases monotonically.
  
  @param srcFilename the source filename, e.g. the included filename
  @param srcLine the source line, e.g. the line in the included file
  @param dstLine the line of the generated file.
  
  @return true if a new entry is needed