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/src/org/eclipse/birt/report/designer/internal/ui/wizards/WizardLibrarySettingPage.java
private static String BUTTON_BROWSE2 = Messages.getString( "PublishLibraryDialog.Label.Browse2" );
	private static final String PLUGIN_ID = "org.eclipse.birt.report.designer.ui.actions.PublishLibraryAction";
	private String[] libraryExtensions = {
		Messages.getString( "report.designer.ui.preferences.extensions" ), 
	};
	private String dialogTitle = Messages.getString( "AddLibraryAction.Dialog.Tilte" ); 
	private File selectedFolder;
	private String fileExt = ".rptlibrary"; 
	private Status pageStatus;
	private String fileName;
	private String folder;
	private Text nameText;
	private Text folderText;
	private Text sourceFileText;
	private Status OKStatus = new Status( IStatus.OK,
			ReportPlugin.REPORT_UI,
			IStatus.OK,
			"", null ); 
	private Status ErrorStatus = new Status( IStatus.ERROR,
			ReportPlugin.REPORT_UI,
			IStatus.ERROR,
			Messages.getString( "WizardLibrarySettingPage.ErrorMessage" ), 
			null );
	private int type;
	public void setType( int type )
	{
		this.type = type;
	}
	public String getSourceFileName( )
	{