Enhancement for all-time chart (nestea back and players comparison)

For the all-time chart :

1) At the moment, we compute the highest ranking achieved for each player starting from period 25, as in hall of fame : 
"To avoid rating artifacts, these records are only counted after 25 periods (i.e. list 25, on February 9th, 2011)." 
I guess it's because is too unreliable before that mark.
However by doing so we are missing by a few weeks Nestea amazing run at GSL open season 2 (end of 2010) and his peak ranking at 1969. Because of that Nestea doesn't even appear in the top 20 of all time, it's a travesty.
I moved back the start period to 17 (octobre 2010). For what I can tell it almost have no impact on the chart, except bringing back Nestea in the top 10. It also help a little TheStc, FruitDealer, Dimaga and Sjow.

2) Add feature : Clicking on a series or a series legend now hide every other series except this one. Then you can readd series one by one by clicking on the corresponding legend. It allow to focus and compare players easily. Especially useful for chart with more than 20 players.