Mismatching points and non-consecutive ranks

[fluix-dev]

So, this could be two (three?) issues in one:

1. Users listed on https://dmoj.ca/users/?page=387 (any any low-rank page) all have the same rank. The same goes for rank by points on user's pages.

2. Users on the previous page have 100 less points, instead of 1 less or the same: https://dmoj.ca/users/?page=386 (non-consecutive rankings)

3. A user on the last page is shown as having rank #38601 but when going to their user page, the rank by points is 12068. (This is probably not a bug)

[quantum5]

The only bug is the pagination offset being used as the starting rank on the page, instead of number of users with more points.