PARTY — Remove the person and organization abstractions altogethe

The Party derived types for Person and Organization add nothing to the
specification and inadvertently get in the way of implementation specific
derivations. The interfaces have no attributes or operations and the class
itself is not used for parameterization or return types from any other
interface. In fact, these two abstractions are not used in anyway
throughout the specification. It becomes inconvenient when derived types
for party are needed and these abstraction names can't be used.

Suggested Action:
Remove the person and organization abstractions altogether. The add value
in a non-normative way by demonstrating where such classes would go, but at
the moment they add nothing.