Would be nice to sort user's coins on "My coins (https://en.numista.com/vous/vos_pieces.php?pays=)" page by "Numista rarity index", purchase price, metal, etc.
Few use cases:
- As a user, I would like to see all my silver coins.
- As a user, I would like to see my coins sorted by purchase price.
- As a user, I would like to see only graded "F" to find a replacement in a better grade (sort by grade, or ability to select a grade).
- As a user, I would like to see coins minted within a specific time frame e.g. "from yyyy - to yyyy".