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/ModuleHandle.java
* 
	 * @param level
	 *            the given depth
	 * @return list of libraries.
	 */
	protected List getLibraries( int level )
	{
		List libraries = module.getLibraries( level );
		List retLibs = new ArrayList( );
		Iterator iter = libraries.iterator( );
		while ( iter.hasNext( ) )
		{
			Library library = (Library) iter.next( );
			retLibs.add( library.handle( ) );
		}
		return Collections.unmodifiableList( retLibs );
	}
	/**
	 * Returns the libraries this report design includes directly. Each in the
	 * returned list is the instance of <code>LibraryHandle</code>.
	 * 
	 * @return the libraries this report design includes directly.
	 */
	public List getLibraries( )
	{
		return getLibraries( IModuleNameScope.DIRECTLY_INCLUDED_LEVEL );
	}
	/**
	 * Returns the library handle with the given namespace.
	 *