Bug 182895 Support sort on Level attribute.
Currently in OLAP engine we only support sort on level key value. We should go ahead to support sort on level attribute value.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/olap/driver/DimensionAxis.java
* 
	 * @param attrName
	 * @return
	 * @throws OLAPException
	 */
	public Object getCurrentMember( String attrName ) throws OLAPException
	{
		return this.edgeInfo.dim_getCurrentMember( dimAxisIndex, attrName, aggrSortType );
	}
	
	/**
	 * 
	 * @param index
	 * @return
	 * @throws IOException
	 */
	public Object getCurrentAggregation( int index ) throws IOException
	{
		return this.edgeInfo.dim_getCurrentAggregation( index );
	}
	/**
	 * 
	 * @param edgeInfoUtil
	 */
	public void setEdgeInfo( EdgeInfoGenerator edgeInfoUtil )
	{
		this.edgeInfo = edgeInfoUtil;
	}
}