[Zope] add role to user (using API)

[Chris Withers]

Jens Vagelpohl wrote:
>     def setLocalRoles(obj, member_ids, member_role, reindex=1):
>         """ Add local roles on an item.
> 
>         Permission -- Always available
>         """
> 
> You pass in the object (folder, content object, etc) you want to set 
> local roles on, a sequence of member IDs, and the role name.

Maybe it should be made clear that the role needs to exist, and that 
setLocalRoles doesn't check that this is the case?

cheers,

Chris

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