2.04.0:zeress:173 867 Carolingian Changes

- Carolingian Empire added to 867 (named so until a non-Karling takes
over, from then on it becomes the HRE). This should lead to much more
fragmenting of the fearsome "Carling Blob" early game in central Europe
- All HRE title holders should now have "Crowned by Pope" at their
proper historical times in the history files