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.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ReportDesignHandle.java
/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.api.ModuleHandle#importCssStyles(org.eclipse.birt.report.model.api.css.CssStyleSheetHandle,
	 *      java.util.List)
	 */
	public void importCssStyles( CssStyleSheetHandle stylesheet,
			List selectedStyles )
	{
		ActivityStack stack = module.getActivityStack( );
		stack.startTrans( );
		for ( int i = 0; i < selectedStyles.size( ); i++ )
		{
			SharedStyleHandle style = (SharedStyleHandle) selectedStyles
					.get( i );
			if ( stylesheet.findStyle( style.getName( ) ) != null )
			{
				try
				{
					module.makeUniqueName( style.getElement( ) );
					addElement( style, IReportDesignModel.STYLE_SLOT );
				}
				catch ( ContentException e )
				{
					assert false;
				}
				catch ( NameException e )
				{
					assert false;
				}