Weighted-scoring

[cassimons]

Purpose

• For discussion.
• As a rule (or on average?), newer submissions should carry more weight than older submissions as they are made in the context of the previous submissions and any new data available.
• So, lets add a weighting to submissions based on their age.

Proposed Changes

• This PR adds a straightforward weighing strategy. It uses the existing algorithm but inflates the relative value of a submission based on recency. Submissions from the last year have a weight of 5, the last two years 4, three years 3, four years 2, older than four years 1

Checklist

• Related GitHub Issue created
• Tests covering new change
• Linting checks pass