always requires a batch of at least 2 bloks to submit a first epoch
block now.

time to test once more on Goerli

Tests required -> add a 'raw' flag to execCairo so I can get the whole
output of the run when I want it

and that first block of epoch has to be submitted pubicly
(this is basically part of/required for the target verification)

also fixed a bug: Target recalculation was skipped if the block whos
target was different was the last block of the batch (which is the most
likely case for relay usage...)