Bug 143173 No error for recursive including when exporting a report to a library
Steps to reproduce: 1.New a library named "Lib", add a lable in it 2.New a report, extends Lib.label 3.Export the report, choose target library "Lib" Expected result: Error to warn the recursive including Actual result: The target library includes itself without error
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/util/ModelUtil.java
.canContain( name );
		ns.insert( theme );
		
		library.getSlot( Library.THEMES_SLOT ).add( theme );
		
		theme.setContainer( library, Library.THEMES_SLOT );
	}
	/**
	 * Uses the new name space of the current module for reference property
	 * values of the given element. This method checks the <code>content</code>
	 * and nested elements in it.
	 * 
	 * @param module
	 *            the module that <code>content</code> attaches.
	 * @param content
	 *            the element to revise
	 * @param nameSpace
	 *            the new name space
	 */
	public static void reviseNameSpace( Module module, DesignElement content,
			String nameSpace )
	{
		List propDefns = content.getPropertyDefns( );
		for ( int i = 0; i < propDefns.size( ); i++ )
		{
			ElementPropertyDefn propDefn = (ElementPropertyDefn) propDefns
					.get( i );
			if ( propDefn.getTypeCode( ) != IPropertyType.ELEMENT_REF_TYPE )
				continue;
			Object value = content.getLocalProperty( module, propDefn );