clarified NEWS: document_files are officially required since Isabelle2014, but the absence was tolerated as legacy feature;
#!/usr/bin/env bash
#
# Author: Florian Haftmann, TU Muenchen
#
# DESCRIPTION: mercurial churn statistics for specified aliases file
ALIAS="${1:-$ISABELLE_HOME/Admin/user-aliases}"
shift
cd "$(dirname "$ALIAS")"
hg churn --aliases "$ALIAS" "$@"