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
ICssStyleSheetOperation sheet = (ICssStyleSheetOperation) element;
		List csses = sheet.getCsses( );
		return CssStyleSheetAdapter.getCssStyleSheetByLocation( module, csses,
				location );
	}
	/**
	 * Gets include css style sheet.
	 * 
	 * @param location
	 *            absolute file name
	 * @return include css style sheet
	 */
	private IncludedCssStyleSheet getIncludedCssStyleSheetByLocation(
			String location )
	{
		if ( location == null )
			return null;
		ICssStyleSheetOperation sheet = (ICssStyleSheetOperation) element;
		List csses = sheet.getCsses( );
		int position = CssStyleSheetAdapter.getPositionOfCssStyleSheet( module,
				csses, location );
		if ( position == -1 )
			return null;
		csses = element.getListProperty( module, IReportDesignModel.CSSES_PROP );
		return (IncludedCssStyleSheet) csses.get( position );
	}
	/**
	 * Reloads the css style sheet with the given file path. After reloading,
	 * acticity stack is cleared.
	 *