[m-dev.] diff: added bag__to_list to bag.m

[Fergus Henderson]

Christopher Rodd SPEIRS, you wrote:
> +	% make a list from a bag.  The constructed list may contain
> +	% duplicates.
> +:- pred bag__to_list(bag(T), list(T)).
> +:- mode bag__to_list(in, out) is det.

The documentation is an under-specification.
Is the list sorted?  If not, what order is it in?
If it contains duplicates, how many duplicates will it contain?

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