Used wrong variable to index
Match the missing season data to the rest

The first two columns, the player and year, are removed before saving
the data. The missing seasons then need to have two removed from the
length of the header.
Pass on season_stats -> _season_stats rename

Forgot to update tests.
Cosmetic change for list data
Ensure every season has the same number of columns
Start creating projections

Starting with multiplying the weights times each season