Add an indexRecords() method and remove ability to set the index.


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@11970 e27351fd-9f3e-4f54-a53b-843176b1656c
Add some placeholders


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@11971 e27351fd-9f3e-4f54-a53b-843176b1656c