Bug 151361 default value for reousrce folder user preference
When user does not sepecify the resourec foler user preference, can we make the current project folder (in IDE) or the current report design file's folder (in RCP) as the default value for the resource folder. This way, by default the current project folder is the resource folder where user can create their libs and images. Also please set the default user preference to be null when BIRT is freshly installed.
UI/org.eclipse.birt.report.designer.ui.lib.explorer/src/org/eclipse/birt/report/designer/ui/lib/explorer/LibraryExplorerContextMenuProvider.java
public LibraryExplorerContextMenuProvider( LibraryExplorerTreeViewPage page )
	{
		super( page.getTreeViewer( ) );
		refreshExplorerAction = new RefreshLibExplorerAction( page );
		addLibraryAction = new AddLibraryAction( page.getTreeViewer( ) );
		useLibraryAction = new AddSelectedLibToCurrentReportDesignAction( page
				.getTreeViewer( ) );
		deleteLibraryAction = new DeleteLibraryAction( page );
	}
	/**
	 * Builds the context menu. Single selection menu and multiple selection
	 * menu are created while selecting just single element or multiple elements
	 * 
	 * 
	 * @param menu
	 *            the menu
	 */
	public void buildContextMenu( IMenuManager menu )
	{
		if ( Policy.TRACING_MENU_SHOW )
		{
			System.out.println( "Menu(for Views) >> Shows for library" ); 
		}
		menu.add( new Separator( IWorkbenchActionConstants.MB_ADDITIONS ) );
		IStructuredSelection selection = (IStructuredSelection) getViewer( )
				.getSelection( );
		if ( selection != null && selection.getFirstElement( ) != null )
		{
			Object selected = selection.getFirstElement( );
			refreshExplorerAction.setSelectedElement( selected );