Bug 212497 Need api to get all referencable report item with cube
Need model provide new api to return all referencable report items for dataset or cube respectively. For instance: getAvailableDataSetBindingReferenceList(); getAvailableCubeBindingReferenceList(); also keep current api: getAvailableDataBindingReferenceList().
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ReportItemHandle.java
boolean inForce ) throws SemanticException
	{
		if ( addColumn == null )
			return null;
		String expr = addColumn.getExpression( );
		List columns = (List) getProperty( BOUND_DATA_COLUMNS_PROP );
		if ( columns == null )
			return (ComputedColumnHandle) getPropertyHandle(
					BOUND_DATA_COLUMNS_PROP ).addItem( addColumn );
		ComputedColumn column = BoundDataColumnUtil.getColumn( columns, expr,
				addColumn.getAggregateFunction( ), addColumn
						.getAggregateOnList( ) );
		if ( column != null && !inForce )
		{
			return (ComputedColumnHandle) column.handle(
					getPropertyHandle( BOUND_DATA_COLUMNS_PROP ), columns
							.indexOf( column ) );
		}
		return (ComputedColumnHandle) getPropertyHandle(
				BOUND_DATA_COLUMNS_PROP ).addItem( addColumn );
	}
	/**
	 * Finds a column binding with the given name.
	 * 
	 * @param name
	 *            name of the binding to find
	 * @return column binding with the given name if found, otherwise null
	 */
	public ComputedColumnHandle findColumnBinding( String name )
	{