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Include Paulo Moura's Logtalk OO LP system

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=================================================================
Logtalk - Object oriented extension to Prolog
Release 2.8.4
Copyright (c) 1998-2001 Paulo Moura. All Rights Reserved.
=================================================================
To load all objects in this example consult the viewpoints.loader utility
file (note that the *.loader files are Prolog files).
Example adopted from the paper "Classifying Prototype-Based Programming
Languages" by Christophe Dony, Jacques Malenfant and Daniel Bardou.
This prototype programming example ilustrates how we can do both property
sharing and value sharing in Logtalk by calling the built-in predicate
modification methods asserta/1, assertz/1 and retract/1 either in the
context of "this" or in the context of "self".
In this example we have a prototype named joePerson, containing general data
on joe like its age, name or address, and three descendants/viewpoints named
joeSportsman, joeEmployee, and joeFilmEnthusiast. Each descendant contains
data related to a particular viewpoint about joe.