Bug 154178 Support projectFolder in BIRT viewer
If the report supports projectFolder, the viewer also need to enhance for this feature.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
* Report working folder.
	 */
	public static String workingFolder = null;
	/**
	 * Document folder to put the report files and created documents.
	 */
	public static String documentFolder = null;
	/**
	 * Preview report max rows
	 */
	public static int maxRows;
	/**
	 * Current web application locale.
	 */
	protected static Locale webAppLocale = null;
	/**
	 * Flag indicating that if user can only access the file in working folder.
	 */
	protected static boolean isDocumentFolderAccessOnly = false;
	/**
	 * Flag indicating that if initialize the context.
	 */
	protected static boolean isInitContext = false;
	/**
	 * Indentify the display text of select parameter
	 */
	protected static final String PREFIX_DISPLAY_TEXT = "__isdisplay__";
	/**
	 * Get bookmark. If page exists, ignore bookmark.
	 *