add option to export CVR-level output file

[chughes297]

Example attached. Wyoming RCV Results -- How Each Ballot Was Counted In Each Round.pdf

[tarheel]

Is this different from the files we already generate?

[chughes297]

i think of it like an altered version of the audit log. Caleb used the audit log to create a spreadsheet showing, in a single row, how any given ballot counted across the whole election.

[tarheel]

OK, got it. And this is just a nice-to-have, right? Or do we need to try to get it into this next release?

[chughes297]

This is nice-to-have