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/Module.java
protected long elementIDCounter = 1;
	/**
	 * The hash map for the id-to-element lookup.
	 */
	protected HashMap idMap = new HashMap( );
	/**
	 * The undo/redo stack for operations on this module.
	 */
	protected ActivityStack activityStack = new ActivityStack( );
	/**
	 * The save state used for dirty file detection. See
	 * {@link org.eclipse.birt.report.model.activity.ActivityStack}for details.
	 */
	protected int saveState = 0;
	/**
	 * The array of name spaces. The meanings of each name space is defined in
	 * {@link org.eclipse.birt.report.model.api.metadata.MetaDataConstants MetaDataConstants}.
	 */
	protected NameSpace nameSpaces[] = new NameSpace[NAME_SPACE_COUNT];
	/**
	 * The array of module name spaces. Each name space has the corresponding
	 * module name space.
	 */
	protected IModuleNameScope moduleNameSpaces[] = new IModuleNameScope[NAME_SPACE_COUNT];
	/**
	 * Internal table to store a bunch of user-defined messages. One message can
	 * be defined in several translations, one translation per locale.
	 */
	protected TranslationTable translations = new TranslationTable( );
	/**