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
* Adds toc structure.
	 * 
	 * @param toc
	 *            toc structure
	 * @return toc handle
	 * @throws SemanticException
	 */
	public TOCHandle addTOC( TOC toc ) throws SemanticException
	{
		setProperty( IReportItemModel.TOC_PROP, toc );
		if ( toc == null )
			return null;
		return (TOCHandle) toc
				.getHandle( getPropertyHandle( IReportItemModel.TOC_PROP ) );
	}
	/**
	 * Gets the item's z position as an integer.
	 * 
	 * @return the z depth. Start from 0
	 */
	public int getZIndex( )
	{
		return super.getIntProperty( IReportItemModel.Z_INDEX_PROP );
	}
	/**
	 * Sets the item's z position to an integer.
	 * 
	 * @param zIndex
	 *            the z depth. Start from 0
	 * @throws SemanticException