Include Paulo Moura's Logtalk OO LP system

git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@53 b08c6af1-5177-4d33-ba66-4b1c6b8b522a

Logtalk/examples/instmethods/SCRIPT

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+=================================================================
+Logtalk - Object oriented extension to Prolog
+Release 2.8.4
+
+Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
+=================================================================
+
+
+% instance1 definition for method "method" is found in its class:
+
+| ?- instance1::method.
+
+This is the default definition for the method, stored in class root.
+
+yes
+
+
+% instance2 overrides definition of method "method"
+
+| ?- instance2::method.
+
+This is an overriding definition stored in the instance2 instance itself.
+
+yes
+
+
+% instance3 specializes definition of method "method"
+
+| ?- instance3::method.
+
+This is a specializing definition stored in the instance3 instance itself.
+It makes a super call to execute the default definition:
+
+This is the default definition for the method, stored in class root.
+
+yes