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
* @param is
	 *            the input stream
	 * @param options
	 *            the options set for this module
	 * @return handle to the library
	 * 
	 * @throws DesignFileException
	 *             if the file is not found, or the file contains fatal errors.
	 */
	public LibraryHandle openLibrary( URL systemId, InputStream is,
			ModuleOption options ) throws DesignFileException
	{
		return session.openLibrary( systemId, is, options ).handle( );
	}
	/**
	 * Creates a new design based on a template. The template name can be
	 * <code>null</code> if no template is desired.
	 * 
	 * @param templateName
	 *            The name of the template for the design, or <code>null</code>
	 *            if no template is needed.
	 * @return A handle to the report design.
	 */
	public ReportDesignHandle createDesign( String templateName )
	{
		return session.createDesign( templateName ).handle( );
	}
	/**
	 * Creates a new empty design. This new design is not based on a template.
	 *