Bug 200471 Add "need not sort for grouping" option in report item
Currently when Data engine proceeds groups, it always sorts the result set according to given group key.However that should not be necessary when the raw data is already sorted. So we'd like to add new options so that user can indicate whether should we sort the data before grouping. In model, we should allow user to set a "need not do sort for grouping" option to all the report element that can be grouped(table, list,etc.)
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/writer/ModuleWriter.java
*/
	private void writeOdaExtensionProperties( DesignElement obj,
			String extensionIDProp )
	{
		IElementDefn extDefn = null;
		if ( obj instanceof OdaDataSource )
			extDefn = ( (OdaDataSource) obj ).getExtDefn( );
		else if ( obj instanceof OdaDataSet )
			extDefn = ( (OdaDataSet) obj ).getExtDefn( );
		if ( extDefn == null )
		{
			ODAProvider provider = null;
			if ( obj instanceof OdaDataSource )
				provider = ( (OdaDataSource) obj ).getProvider( );
			if ( obj instanceof OdaDataSet )
				provider = ( (OdaDataSet) obj ).getProvider( );
			if ( provider instanceof OdaDummyProvider )
				writeOdaDummyProperties( obj, provider );
			return;
		}
		List list = extDefn.getLocalProperties( );
		for ( int i = 0; i < list.size( ); i++ )
		{
			PropertyDefn prop = (PropertyDefn) list.get( i );
			if ( extensionIDProp.equals( prop.getName( ) ) )
				continue;
			Object value = obj.getLocalProperty( getModule( ), prop.getName( ) );
			if ( value != null )
			{
				boolean cdata = false;