py3: switch to use Python 3 interpreter, temporarily leaving many things very broken until they have been migrated/fixed in a reviewable way Bump Mercurial minimum version to 5.2 - the first version that claim stable py3 support.

#!/bin/sh

# Convenience script for running various idempotent source code cleanup scripts

set -e
set -x

scripts/docs-headings.py
scripts/generate-ini.py
scripts/whitespacecleanup.sh