"Attribute Authority" configuration

[Rod Widdowson]

> I would suggest we *not* support it and just ignore (perhaps log a
> warning) the setting.

That would be my preferred solution.

> >- Do we intend supporting multiple attribute filters or attribute
> >resolvers
> >any way other than by explicit editing in
> >idp-conf/src/main/resources/system/*.xml
> 
> I do not think we should at this time.

That too.  

I'll not be done in this area for a while so we have time to finalize this
call; for now this is a great simplification.

Rod