[Python-3000] Abilities / Interfaces

[Andrew Koenig]

> I'll try to make an argument for "Interface" over "Ability" using
> examples from Zope.

> It seems to me that not all interfaces coincide with something the
> object can _do_.  Some speak to what can be done _to_ an object:

When I see the word "interface", I think of the collection of method calls
that a type supports, because the word is used that way in other well-known
programming languages.  I am suggesting the word "ability" because it covers
more than just method calls.