I found someone which the relevant Matlab versions installed. So here is the answer:
- Until R2010b, the cells had 4 fields: Name, header file, description, bus elements.
- In R2011a, the cells had 5 fields: Name, header file, description, data scope, bus elements.
- From R2011b until today (R2016a), the cells have 6 fields: Name, header file, description, data scope, alignment, bus elements.