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.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/adapter/ModelDteApiAdapter.java
dteDataSet.setCloseScript( modelDataSet.getClose( ) );
		dteDataSet.setDescribeScript( modelDataSet.getDescribe( ) );
		return dteDataSet;
	}
	void adaptBaseDataSet( DataSetHandle modelDataSet,
			BaseDataSetDesign dteDataSet ) throws BirtException
	{
		if ( (!(modelDataSet instanceof JointDataSetHandle)) && modelDataSet.getDataSource( ) == null )
			throw new EngineException(
					"The data source of this data set can not be null." );
		if ( !( modelDataSet instanceof JointDataSetHandle ) )
		{
			dteDataSet.setDataSource( modelDataSet.getDataSource( )
					.getQualifiedName( ) );
			dteDataSet.setBeforeOpenScript( modelDataSet.getBeforeOpen( ) );
			dteDataSet.setAfterOpenScript( modelDataSet.getAfterOpen( ) );
			dteDataSet.setOnFetchScript( modelDataSet.getOnFetch( ) );
			dteDataSet.setBeforeCloseScript( modelDataSet.getBeforeClose( ) );
			dteDataSet.setAfterCloseScript( modelDataSet.getAfterClose( ) );
			HashMap paramBindingCandidates = new HashMap( );
			Iterator elmtIter = modelDataSet.parametersIterator( );
			if ( elmtIter != null )
			{
				while ( elmtIter.hasNext( ) )
				{
					DataSetParameterHandle modelParam = ( DataSetParameterHandle ) elmtIter
							.next( );
					dteDataSet.addParameter( newParam( modelParam ) );