add abbreviation int_of_nat for of_nat::nat=>int;
add int_of_nat versions of all lemmas about int::nat=>int;
move int lemmas into their own section, preparing to remove
#!/usr/bin/env bash
#
# $Id$
# Author: Makarius
#
# DESCRIPTION: Update standard keyword files.
isabelle -qe 'ProofGeneral.write_keywords "";' IOA
isabelle -qe 'ProofGeneral.write_keywords "HOL-Nominal";' HOL-Nominal
isabelle -qe 'ProofGeneral.write_keywords "ZF";' ZF