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

[Andrew Bromage]

G'day.

Christopher Rodd SPEIRS wrote:

> library/bag.m:
> 	Added a bag__to_list/2 predicate which produces a list 
> 	from a bag.

Don't forget to add this to the NEWS file.

Cheers,
Andrew Bromage