Bug 178164 Use IEngineTask.status constants and remove unnecessary status variables in EngineTask.
1)Remove following redundant variables in EngineTask used for status info. protected final int RUNNING_STATUS_START = 0; protected final int RUNNING_STATUS_RUNNING = 1; protected final int RUNNING_STATUS_STOP = 2; EngineTask already has access to constants declared in IEngineTask. Use those instead. 2)Remove the unused errorHandlingOption in EngineTask.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/RenderTask.java
{
	IReportDocument reportDoc;
	String emitterID;
	private InnerRender innerRender;
	/**
	 * @param engine
	 *            the report engine
	 * @param runnable
	 *            the report runnable object
	 * @param reportDoc
	 *            the report document instance
	 */
	public RenderTask( IReportEngine engine, IReportRunnable runnable,
			IReportDocument reportDoc )
	{
		super( engine, runnable, IEngineTask.TASK_RENDER );
		executionContext.setFactoryMode( false );
		executionContext.setPresentationMode( true );
		
		openReportDocument( reportDoc );
		
		
		loadDesign( );
		innerRender = new PageRangeRender( new long[]{1,
				this.reportDoc.getPageCount( )} );
	}
	protected void openReportDocument( IReportDocument reportDoc )