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/core/DesignSession.java
}
	/**
	 * Creates a new design not based on a template.
	 * 
	 * @return The new report design.
	 */
	public ReportDesign createDesign( )
	{
		return createDesign( null );
	}
	/**
	 * Creates a new library.
	 * 
	 * @return the created library.
	 */
	public Library createLibrary( )
	{
		Library library = new Library( this );
		Theme theme = new Theme( ModelMessages
				.getMessage( Theme.DEFAULT_THEME_NAME ) );
		library.setProperty( IModuleModel.THEME_PROP, new ElementRefValue(
				null, theme ) );
		ModelUtil.insertCompatibleThemeToLibrary( library, theme );
		
		theme.setID( library.getNextID( ) );
		library.addElementID( theme );
		library.setValid( true );
		libraries.add( library );
		return library;
	}