Added access to the mk_rews field (and friends).
ISABELLE COPYRIGHT NOTICE, LICENCE AND DISCLAIMER.
Copyright (C) 2003 by the University of Cambridge, Cambridge, UK and
by the Technical University of Munich, Munich, Germany.
Permission to use, copy, modify, and distribute this software and its
documentation for any non-commercial purpose and without fee is hereby
granted, provided that the above copyright notice appears in all copies and
that both the copyright notice and this permission notice and warranty
disclaimer appear in supporting documentation, and that the name of the
University of Cambridge or the Technical University of Munich not be used in
advertising or publicity pertaining to distribution of the software without
specific, written prior permission.
The University of Cambridge and the Technical University of Munich disclaim
all warranties with regard to this software, including all implied warranties
of merchantability and fitness. In no event shall the University of Cambridge
or the Technical University of Munich be liable for any special, indirect or
consequential damages or any damages whatsoever resulting from loss of use,
data or profits, whether in an action of contract, negligence or other
tortious action, arising out of or in connection with the use or performance
of this software.