Bug 201368 Support "Not In" operator in filter list
Description: After we support "IN" filter we should also support the "Not In" filter. Data part has already support the "Not In" filter, so hope model can support that operator in the filter operator list. Regards!
model/org.eclipse.birt.report.model.tests/test/org/eclipse/birt/report/model/library/LibraryParseTest.java
assertEquals(
				"reslove.css", ( (CssStyle) labelHandle2.getStyle( ).getElement( ) )
						.getCssStyleSheet( ).getFileName( ) );
	}
	/**
	 * Tests drop css style sheet
	 * 
	 * @throws Exception
	 */
	public void testDropCssStyleSheetOperation( ) throws Exception
	{
		openDesign( "LibraryParserWithCss_Drop.xml" ); 
		
		LabelHandle labelHandle = (LabelHandle) designHandle
				.findElement( "label" );
		
		LabelHandle labelHandle2 = (LabelHandle) designHandle
				.findElement( "label2" );
		
		assertTrue( ( (CssStyle) labelHandle.getStyle( ).getElement( ) )
				.getContainer( ) instanceof Theme );
		
		assertTrue( ( (CssStyle) labelHandle2.getStyle( ).getElement( ) )
				.getContainer( ) instanceof ReportDesign );
		
		CssStyleSheetHandle sheetHandle = (CssStyleSheetHandle) designHandle
				.getAllCssStyleSheets( ).get( 0 );
		designHandle.dropCss( sheetHandle );
		
		assertTrue( ( (CssStyle) labelHandle.getStyle( ).getElement( ) )