Revised scoring system

After a lot of thought, and some experimentation, I’ve updated the scoring system. The new “max score” is now simply ten times the expected number of entries, and actual score is ten times the number we actually have minus two times the number of PositionHolderHistory warnings. This eliminates the edge cases (negative scores, or 0% even when there’s useful data), and better emphasises the value of data being present over there being an issue with it (on the basis that it’s generally easier to spot and fix problem data than missing data).

I’ve updated the spreadsheet, and will also backfill the new score across the previous posts here.