[IdP]<SAMLObjectName>

[Rod Widdowson]

I took an AI yesterday to look at other places where there is a 1-1 match
between a SAML type and an IdP type with a view to ensuring that the code
makes it clear which type we are talking about.

It seems that in addition to Attribute we also have AttributeValue and
RequestedAttribute.    There may be others, but these are the big ticket
items.

I intend making the conversion Attribute -> IdPAttribute quite soon and
immediately after I'll do the same to RequestedAttribute.

AttributeValue actually required two sets of refactoring.  In many cases the
code is written in terms of the raw type (AttributeValue, not
AttributeValue<?>) and we need to fix this.  Fixing this will take much
longer than the name change but I need to make sure that they are separate
checkins.  Hence I intend doing two passes over the code, the first to deal
with the type issue and the second the name.  That way the disruption will
be minimal.

Rod