Bug 209309 Show javascript errorposition
If a javascript expression has errors, the error message is shown in the last lines in the preview tab. But there is no info where the error occurs. In most cases you had to guess the error location. It would be very helpfull to display the error location.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/executor/ExecutionContext.java
*/
	private TimeZone timeZone;
	
	/**
	 * report document, may be the output or input.
	 */
	private IReportDocument reportDoc;
	/**
	 * the created report content
	 */
	private IReportContent reportContent;
	/**
	 * the current executed design.
	 */
	private ReportItemDesign design;
	/**
	 * The current content element to be executed or loaded
	 */
	private IContent content;
	
	/**
	 * the current opened result set 
	 */
	private IBaseResultSet[] rsets; 
	/**
	 * A stack of handle objects, with the current one on the top
	 */
	private Stack reportHandles = new Stack( );
	/**
	 * total page