Bug 121498 When datasource/dataset deleted, the datasource/dataset property binding element haven't been deleted
When deleted the datasource/dataset, the datasource/dataset property binding element haven't been deleted. Expected result: This operation must be a transaction.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/Module.java
libraries.add( library );
		}
	}
	/**
	 * Returns all libaries this module contains.
	 * 
	 * @return list of libraries.
	 */
	public List getAllLibraries( )
	{
		if ( libraries == null )
			return Collections.EMPTY_LIST;
		List allLibraries = new ArrayList( );
		allLibraries.addAll( getLibraries( ) );
		Iterator iter = getLibraries( ).iterator( );
		while ( iter.hasNext( ) )
		{
			Library library = (Library) iter.next( );
			allLibraries.addAll( library.getAllLibraries( ) );
		}
		return allLibraries;
	}
	/**
	 * Returns only libraries this module includes directly.
	 * 
	 * @return list of libraries.
	 */
	public List getLibraries( )
	{
		if ( libraries != null )