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

[Ralph Becket]

Simon Taylor, Thursday, 11 October 2001:
> 
> I don't think it works very well when field accesses or updates are
> nested. To me,
> 	X !! 1 ^ field := Value
> doesn't (mentally) parse as well as
> 	X ^ elem(1) ^ field := Value.

`(X !! 1) ^ field' looks fine to me.

Still, we probably don't need yet more syntax.

- Ralph
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