Use negative numbers, rather than Roman numerals, for starting rules (thanks, @wlonk!)

Kit pointed out a defect in my modifications:

> Rule xxvi defines precedence within the immutable or mutable sets as being defined by the lower ordinal number.
>
> Rule viii gives new rules numbers assigned by GitHub.
>
> Within the first few turns, a rule can be transmuted from mutable to immutable, or vice versa, and there can be non-unique numbering within a set. So we could end up with rule 6 and Rule vi both being, say, immutable, and no precedence being defined for them.

Rather than make a more intrusive change, I've instead renumbered the rules to negative indices.

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