[m-rev.] for review: fix a bug in bimap.set/4

[Ralph Becket]

Julien Fischer, Monday,  7 March 2005:
> 
> Estimated hours taken: 2
> Branches: main, release
> 
> The current implementation of of bimap.set/4 breaks if you try
> to set a Key-Value pair that have already been mapped to each other.

Looks good.
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