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/utility/ParameterAccessor.java
* @return
	 */
	public static Number getDpi( HttpServletRequest request )
	{
		String dpi = getParameter( request, PARAM_DPI );
		if ( dpi == null || dpi.trim( ).length( ) <= 0 )
			return null;
		return Integer.valueOf( dpi );
	}
	/**
	 * Returns the separator String
	 * 
	 * @param sep
	 * @return
	 */
	public static char getSep( HttpServletRequest request )
	{
		String sepKey = getParameter( request, PARAM_SEP );
		if ( sepKey == null )
			return DEFAULT_SEP;
		String key = "viewer.sep." + sepKey; 
		String sep = getInitProp( key );
		if ( sep.length( ) <= 0 )
			return DEFAULT_SEP;
		return sep.charAt( 0 );
	}
	/**
	 * Set isCleanSessionFiles
	 * 
	 * @param request