Admin/build_history

fixed veriT environment variable in sledgehammer's documentation

#!/usr/bin/env bash
#
# DESCRIPTION: build history versions from another repository clone

unset CDPATH
THIS="$(cd "$(dirname "$0")"; pwd)"

"$THIS/../bin/isabelle" scala_build -q || exit $?
"$THIS/../bin/isabelle_java" isabelle.Build_History "$@"