code: public String getChangeInfo(String preText) {
          StringBuilder s = new StringBuilder();
          s.append(preText + "\n");
          s.append("Subject: " + getSubject() + "\n");
          s.append("Project: " + getProject() + "  " + getBranch() + "  " + getId() + "\n");
          s.append("Link:    " + getUrl() + "\n");
          return s.toString();
      }
docs: Returns change's info in string format.
  @param preText the text before change info.
  @return change info.