Migration for content group publishingMode
- Set publishingModeto- 
NONEifpublishedflag is false orfirstPublishedIndex == -1.
- 
ALLiffirstPublishedIndex == 0andlastPublishedIndexis either -1 or max value.
- 
SINGLEiflastPublishedIndex - firstPublishedIndex== 0`.
- 
UP_TOiffirstPublishedIndex == 0.
- Otherwise: NONE(reset publishing state because ranges are no longer supported)
 
- 
- Set publishingIndexto- 
0ifpublishingModeisNONEorALL.
- Otherwise: the value of lastPublishedIndex
 
- 
- Remove published,firstPublishedIndexandlastPublishedIndexproperties.
Edited  by Daniel Gerhardt