[m-rev.] Add `:- mutable' declaration to the language.

[Ralph Becket]

Julien Fischer, Thursday,  1 September 2005:
> 
> We could a `pure' attribute to the :- mutable declarations.  With
> this attribute set the compiler would generate a, presmuably divine,
> pairof access predicates.

I will add this as a separate change.
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