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/src/org/eclipse/birt/report/model/command/CssCommand.java
* @param sheet
	 *            css style sheet
	 * @throws SemanticException
	 * 
	 */
	public void reloadCss( CssStyleSheet sheet ) throws SemanticException
	{
		if ( sheet == null )
			return;
		String fileName = sheet.getFileName( );
		
		
		CssStyleSheet newStyleSheet;
		try
		{
			newStyleSheet = module.loadCss( fileName );
		}
		catch ( StyleSheetException e )
		{
			throw new CssException( module, new String[]{fileName},
					CssException.DESIGN_EXCEPTION_BADCSSFILE );
		}
		List csses = ( (ICssStyleSheetOperation) element ).getCsses( );
		int pos = csses.indexOf( sheet );
		ActivityStack activityStack = getActivityStack( );
		activityStack.startSilentTrans( );
		
		
		CssRecord record = new CssRecord( module, element, sheet, false );
		getActivityStack( ).execute( record );