Changing deck match-quality from count to quotient

When you define deck A with 4 card and deck B with 10 cards. Then
result C will match A=4, B=5 cards then A is a better match. Its a
100% match as opposed to 50% to B.

This allows you to define some general deck-categories and more
specific decks. If the deck matches a specific deck well, it will be
selected otherwise it will fall back to a general deck.