Fix/the first epoch downloaded has incomplete data #136
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Description
The first epoch downloaded when running goteth would allways have the
PrevState.EmptyStateRoot()
flag on. This means that this epoch would be stored with incomplete data on the database.Now we wait until we have 2 epochs downloaded before the current epoch to start storing epoch and rewards data. This ensures that we have the required info and there isn't incomplete data. Goteth now always downloads two epochs before the starting point as well to not leave gaps.
Closes #131