Historical data update (Patreon)

I've gone ahead and updated the data in the shared spreadsheet. It now contains all player-seasons since the shot clock (1955) with some notable additions, mainly: 

-My BPM model (overall and defense)

-My BPM model for the playoffs - you'll see a playoff-only number ("PS") and a RS-PS blend that gives the PS performance more weight

I've added a tab in the sheet that sorts all seasons by this RS-PS blend. I've also added team-based metrics at the end to help contextualize player-seasons. 

https://docs.google.com/spreadsheets/d/1UPt5oybqcWmazOhQ8JVA4kdchKh14DufF3JYWcZNJ8M/edit?usp=sharing