Remobe beopen/cnri/cwi copyrights, according to CNRI instructions.

This doesn't change the copyright status for these files -- just the
markings!  Doing it on the main branch for these three files for which
the HEAD revision was pushed back into 1.6.

Include/abstract.h

@@ -4,16 +4,6 @@
 extern "C" {
 #endif
 
-/***********************************************************
-Copyright (c) 2000, BeOpen.com.
-Copyright (c) 1995-2000, Corporation for National Research Initiatives.
-Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
-All rights reserved.
-
-See the file "Misc/COPYRIGHT" for information on usage and
-redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-******************************************************************/
-
 /* Abstract Object Interface (many thanks to Jim Fulton) */
 
 /*

Modules/socketmodule.c

-/***********************************************************
-Copyright (c) 2000, BeOpen.com.
-Copyright (c) 1995-2000, Corporation for National Research Initiatives.
-Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
-All rights reserved.
-
-See the file "Misc/COPYRIGHT" for information on usage and
-redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-******************************************************************/
-
 /* Socket module */
 
 /* SSL support based on patches by Brian E Gallew and Laszlo Kovacs */

Objects/abstract.c

-/***********************************************************
-Copyright (c) 2000, BeOpen.com.
-Copyright (c) 1995-2000, Corporation for National Research Initiatives.
-Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
-All rights reserved.
-
-See the file "Misc/COPYRIGHT" for information on usage and
-redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-******************************************************************/
-
 /* Abstract Object Interface (many thanks to Jim Fulton) */
 
 #include "Python.h"