Requires that a 'reviewers' group exist, and that there are people assigned to it (otherwise it won't find any reviewers to add!).
It will assign up to 3 reviewers, where those reviewers are NOT one of the speakers, and that reviewer has not opted out of reviewing that talk. It will choose random reviewers from those with the fewest existing not-opted-out assignments.
When a review was not the latest it would cause a bug on deletion of the
latest. We changed the logic to work with the latest vote versus the previous
to fix this issue. Now all review deletion ensure a consistent latest vote
state.
The original default value of one assumed ProposalResult was being created
when a Review was created which meant a comment and a vote was made. This is
no longer the case from changes after the original change and has caused off
by one errors in the denormalized count.
