Batch encryption not doing ballot chaining.

[JohnLCaron]

Currently we are not writing the ballot chaining when batch encrypting, onlt ehwn calling encryption one at a time with AddEncryptedBallot.

This is caught by the Verifier at step 7:
verifyConfirmationChain Err(readEncryptedBallotChain path 'testOut/cliWorkflow/electionRecord/encrypted_ballots/device42/ballot_chain.json' does not exist)

Seem like we can have batch encryption put AddEncryptedBallot into a single thread and call it.
The main cost is the encryption, so those need to stay multithreaded.

[JohnLCaron]

The problem is that we need the previous confirmation code before we can start the next one.

I could imagine that we have n chains going at once. For very large batches, it would make sense to limit the size of the chain.

So im leaving this one alone for now.