Rename was not sorting by entity

The lack of re-targeting PRs in GH is kinda annoying
> Mmmm, I am not 100% sure of the consequence of this, the grouping is no longer consistent with the sort.

Yeah I had the same concern. I asked Russell, and he seemed OK. But if we're worried I can always add a slightly different layout (or dig deeper into Hadoop).

So I take it we don't want to group by entity?