Bug 136246 [regression]Export data exported error column name.
Description: Export data exported error column name. Steps to reproduce: 1. export data in a table, select several columns. Expected result: Selected column name and data are exported. Actual result: No matter what columns you selected, exported columns name always display columns beginning from the first, and then the second, and so on.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/ReportEngineService.java
* 
	 * @return
	 */
	public static ReportEngineService getInstance( )
	{
		return instance;
	}
	/**
	 * Get engine instance. This method is not thread safe should be protected
	 * by the caller.
	 * 
	 * @return engine instance
	 * @throws BirtException
	 */
	public static void initEngineInstance( ServletConfig servletConfig )
			throws BirtException
	{
		if ( ReportEngineService.instance != null )
			return;
		ReportEngineService.instance = new ReportEngineService( servletConfig );
	}
	/**
	 * Get all the files under the specified folder (including all the files
	 * under sub-folders)
	 * 
	 * @param dir -
	 *            the folder to look into
	 * @param fileList -
	 *            the fileList to be returned
	 */