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
if ( StringUtil.isBlank( expression ) )
			return;
		if ( tocHandle == null )
		{
			TOC toc = StructureFactory.createTOC( expression );
			addTOC( toc );
		}
		else
		{
			tocHandle.setExpression( expression );
		}
	}
	/**
	 * Returns the expression evalueated as a table of contents entry for this
	 * item.
	 * 
	 * @return the expression evaluated as a table of contents entry for this
	 *         item
	 * @see #setTocExpression(String)
	 * @deprecated
	 */
	public String getTocExpression( )
	{
		TOCHandle tocHandle = getTOC( );
		if ( tocHandle == null )
			return null;
		return tocHandle.getExpression( );
	}
	/**
	 * Gets the on-prepare script of the group. Startup phase. No data binding