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/library/debugging.notes

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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 group consult the debugging.loader utility 
+file.
+
+You will also need to load FIRST the events.loader file.
+
+
+The object debugger enables you to:
+
+	- spy all or specific messages to an object
+	- trace an execution
+	- specify the streams used for debugger input/output
+
+These capabilities rely on the use of the event-based programming built in 
+Logtalk. That means that you can only debug public messages sent using the 
+::/2 operator.
+
+You can have any number of debuggers active simultaneously, possibly 
+assigning different input/output streams to each one.
+
+Input/output is one area where Prologs compilers can differ, sometimes
+because of differences in the underlying operating system. Therefore,
+it is advisable that you look at the code of class debugger before
+trying to use it. The i/o operations are done by the methods output/3, 
+query_user/1 and execute_option/1.