[m-dev.] Language interface improvements

[Fergus Henderson]

Peter Schachte, you wrote:
> 
> The most convenient way to do this would be to have Mercury treat C structs
> as Mercury terms.

FWIW, Visual Prolog has a separate keyword `struct' used for this purpose.
Data types in VP can be (amoung other things) discriminated unions or structs.
If a data type is a struct, then it can have only one functor, but
it is represented in the same way as the corresponding C struct.

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