lib/Tools/version

Defined rationals (Rats) globally in Rational.
Chractarized them with a few lemmas in RealDef, one of them from Sqrt.

#!/usr/bin/env bash
#
# $Id$
# Author: Stefan Berghofer, TU Muenchen
#
# DESCRIPTION: display Isabelle version


echo 'Isabelle repository version'    # filled in automatically!