[m-dev.] Introduce !! rather than ^elem() for indexing

[Michael Day]

> If you want this you do it in the following way:
>
> :- type [A|B] == list(A).
> :- type [] ---> [].
>
> :- type foo == [int].
>
> (nb [int] = [int|[]]).

That's very clever, and will reduce my typing considerably :) Passing a
list of lists of string now becomes [[string]] rather than
list(list(string)), which is pleasantly concise. And rather like Haskell,
I believe?

Michael

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