Bug 123939 [Smoke][Regression]Drill through link doesn't work in pdf.
Description: Drill through link doesn't work in pdf. Steps to reproduce: 1. View attached design file url.rptdesign in html/pdf, click the drill though link in the last three image. Result: Drill through link doesn't work in pdf. Some links in html also don't work.
engine/org.eclipse.birt.report.engine.emitter.pdf/src/org/eclipse/birt/report/engine/emitter/pdf/PDFEmitter.java
{
	/**
	 * the default output pdf file name
	 */
	public static final String REPORT_FILE = "Report.pdf"; 
	
	/**
	 * the default image folder
	 */
	public static final String IMAGE_FOLDER = "image"; 
	
	/**
	 * the output stream
	 */
	private OutputStream output = null;
	
	/**
	 * the emitter configturation
	 */
	
	
	/**