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
GridData data = new GridData( GridData.BEGINNING );
		previewLabel.setLayoutData( data );
		templateList = new List( composite, SWT.BORDER );
		createCustomTemplateList( );
		for ( Iterator it = templates.iterator( ); it.hasNext( ); )
		{
			templateList.add( ( (Template) it.next( ) ).getName( ) );
		}
		data = new GridData( GridData.BEGINNING | GridData.FILL_VERTICAL );
		data.widthHint = 170;
		templateList.setLayoutData( data );
		previewPane = new Composite( composite, 0 );
		data = new GridData( GridData.FILL_HORIZONTAL | GridData.FILL_VERTICAL );
		previewPane.setLayoutData( data );
		gridLayout = new GridLayout( );
		gridLayout.verticalSpacing = 10;
		previewPane.setLayout( gridLayout );
		previewCanvas = new ImageCanvas( previewPane, SWT.BORDER );
		data = new GridData( GridData.BEGINNING );
		data.heightHint = 229;
		data.widthHint = 184;
		previewCanvas.setLayoutData( data );
		Label descriptionTitle = new Label( previewPane, SWT.NONE );
		descriptionTitle.setText( MESSAGE_DESCRIPTION );
		data = new GridData( GridData.FILL_HORIZONTAL );
		descriptionTitle.setLayoutData( data );
		description = new Label( previewPane, SWT.WRAP );
		data = new GridData( GridData.FILL_HORIZONTAL );
		data.widthHint = 184;
		data.horizontalIndent = 20;