Fix incorrect global rating graph spikes

[Penguin5]

Many players' global rating graphs have incorrect spikes in rating from earlier this year, possibly related to changes for TMM... These spikes should be removed and or replaced with the proper rating. Example spikes:

[Sheikah45]

This is probably not fixable as those games just reported the wrong rating for the wrong rating type and would require manually going into the database to find and remove the dirty games for each player. At least as far as I am aware.

[Penguin5]

I'd imagine it could be fixed with an algorithm that finds and removes the dirty games.

[Sheikah45]

Any algorithm will have false positive and remove legitimate data which may be undesirable. But again it comes to time benefit for someone to characterize it and to write the algorithm and take downtime for the server to run it. And traditionally we haven't done manual changing of the database. But that is just my view.