Bug 136279 Structure and table datatypes should be hidden.
Description: Structure and table datatype should be hidden. Steps to reproduce: In table data binding, I saw structure and table two datatypes. They are not supported now, so they should be removed.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/wizards/WizardTemplateChoicePage.java
description.setLayoutData( data );
		new Label( previewPane, SWT.NONE );
		chkBox = new Button( composite, SWT.CHECK );
		chkBox.setText( MESSAGE_SHOW_CHEATSHEET );
		chkBox.setSelection( ReportPlugin.readCheatSheetPreference( ) );
		chkBox.addSelectionListener( new SelectionListener( ) {
			public void widgetSelected( SelectionEvent e )
			{
				ReportPlugin.writeCheatSheetPreference( chkBox.getSelection( ) );
			}
			public void widgetDefaultSelected( SelectionEvent e )
			{
				ReportPlugin.writeCheatSheetPreference( chkBox.getSelection( ) );
			}
		} );
		hookListeners( );
		templateList.select( 0 );
		templateListener.handleEvent( new Event( ) );
		setControl( composite );
	}
	private void createCustomTemplateList( )
	{
		String templateFolderPath = ReportPlugin.getDefault( )
				.getTemplatePreference( );
		File templateDirectory = new File( templateFolderPath );
		if ( templateDirectory.isDirectory( ) )
		{
			File[] filesArray = templateDirectory.listFiles( new FilenameFilter( ) {
				public boolean accept( File dir, String name )
				{