Bug 152828 Add the projectFolder property on module
When user doesn't set the resource folder path in designer, there should be a default working path for Birt to manage the report design and find the related resources. A new property should be added on Module: name: projectFolder type:URL This property only can be given from the open design method from session but should not be set after the module initialized. Concern about the backward compatiblity issue, a new method will be added. Open design with a config argument.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/SessionHandle.java
* @return the handle of the new report design.
	 */
	public ReportDesignHandle createDesign( )
	{
		return session.createDesign( ).handle( );
	}
	/**
	 * Creates a new empty library.
	 * 
	 * @return the handle of the new library.
	 */
	public LibraryHandle createLibrary( )
	{
		return session.createLibrary( ).handle( );
	}
	/**
	 * Saves all designs and librariesthat need a save.
	 * 
	 * @throws IOException
	 *             if a save error occurs
	 */
	public void saveAll( ) throws IOException
	{
		Iterator iter = session.getModuleIterator( );
		while ( iter.hasNext( ) )
		{
			Module module = (Module) iter.next( );
			ModuleHandle handle = (ModuleHandle) module.getHandle( module );
			if ( handle.needsSave( ) )
				handle.save( );