DAL: set blocks per epoch to 1
And also fix some remaining issues related to MR !10254 (merged).
Closes #4672 (closed) as well, given that
- I think now all occurrences of
attested_levelandattestation_levelare used as hinted in the comment of the removed TODO. - I don't think we really need to rename the field, and leaving it as is would be in line with consensus operations.
Edited by Eugen Zalinescu