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
/**
	 * 
	 * @return
	 * @throws OLAPException
	 */
	public long getEdgeEnd( ) throws OLAPException
	{
		return this.edgeInfo.getEdgeEnd( dimAxisIndex );
	}
	/**
	 * 
	 * @return
	 * @throws OLAPException
	 */
	public long getEdgeStart( ) throws OLAPException
	{
		return this.edgeInfo.getEdgeStart( dimAxisIndex );
	}
	/**
	 * 
	 * @param attr
	 * @return
	 * @throws OLAPException
	 */
	public Object getCurrentMember( int attr ) throws OLAPException
	{
		return this.edgeInfo.dim_getCurrentMember( dimAxisIndex, attr, aggrSortType );
	}
	
	/**