Bug 193875 we can not get an entir url by IHTMLActionHandler
we can not get an entir url by IHTMLActionHandler, so word emitter dose not write the right url. now hyperlink drill through in word emitter doesn't work.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/ReportEngineService.java
config.setEngineHome( "" ); 
	}
	/**
	 * Get engine instance.
	 * 
	 * @return the single report engine service
	 */
	public static ReportEngineService getInstance( )
	{
		return instance;
	}
	/**
	 * Get engine instance.
	 * 
	 * @param servletConfig
	 * @throws BirtException
	 * 
	 */
	public synchronized static void initEngineInstance(
			ServletConfig servletConfig ) throws BirtException
	{
		initEngineInstance( servletConfig.getServletContext( ) );
	}
	/**
	 * Get engine instance.
	 * 
	 * @param servletContext
	 * @throws BirtException
	 * 
	 */