Unused option in fitb problems

[bjones1]

I noticed the option blankid in the fitb code, but don't see that it's used anywhere else. Can we delete this? Do you remember what it was for?

[bnmnetp]

I am quite sure that was from the olden days when we had a separate directive for the blank.

[bjones1]

OK, thanks. I'll submit a PR removing it, then.