[AFS3-std] updated extended callback draft

[David Boyes]

> To try to get consensus on this minor point, I'm prepared to change
the
> published names of these constants (with apologies to Derrick, because
I
> prefer having some fun in the code too, and liked these)...
>=20
> If folks not heard from have opinions, I'd request they chime in?

Use your suggested changes. The IHateYou et al names are cute, but they
don't help anyone understand what the code is actually doing, which is
kind of The Point.=20