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

[Ralph Becket]

Ian MacLarty, Thursday,  1 September 2005:
> 
> I still think these should be supplied.
> 
> If the pure versions are supplied then they can be used without having 
> any knowledge of the impurity system (which can take a while to learn 
> to use properly, especially if you are new to Mercury).
> With the pure versions there is no burden on the user to promise that 
> they are pure and therefore no need to understand the impurity system.
> This would make the :-mutable declarations more generally accessible.

We don't want `mutable' declarations to be generally accessible, for
they are an abomination in the sight of God.  Albeit sometimes
necessary.

-- Ralph
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