[OpenID] Recommendation for future OpenID spec

[SitG Admin]

>Adding an openid.testing_only=true parameter would not accomplish 
>anything, because if it did, I could take your OpenID, tack on 
>openid.testing_only, and suddenly be able to get the OP to assert 
>your identity although it isn't you.  That obviously isn't 
>acceptable.

I'm having another not-solid thought about NIST level negative one, 
but I'm squashing it.

I can see how enabling test mode could be problematic for multi-user 
Providers; also, such a check would have burdened libraries that 
otherwise need not concern themselves with whether such an argument 
is present or not.

-Shade