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/ModuleHandle.java
* @param elements
	 * @return all cube elements
	 */
	private List getCubeList( List elements )
	{
		if ( elements == null )
			return null;
		List cubes = new ArrayList( );
		for ( int i = 0; i < elements.size( ); i++ )
		{
			DesignElement element = (DesignElement) elements.get( i );
			if ( element.getDefn( ).isKindOf(
					MetaDataDictionary.getInstance( ).getElement(
							ReportDesignConstants.CUBE_ELEMENT ) ) )
				cubes.add( element );
		}
		return cubes;
	}
	/**
	 * Returns all cube handles that this modules and the included modules
	 * contain.
	 * 
	 * @return all cube handles that this modules and the included modules
	 *         contain.
	 */
	public List getAllCubes( )
	{
		List elementList = module.getNameHelper( ).getElements(
				Module.CUBE_NAME_SPACE, IAccessControl.ARBITARY_LEVEL );
		List cubeList = getCubeList( elementList );