About to:
- commit all changes
- tag this release as v$version
- - remove hard-linked top-level files for outdated version$skipping
- - hard-link src files into top-level dir$skipping
+ - update hard-linked top-level files for new version$skipping
- create release tar, "$srctar_name"
- create patches tar, "$pattar_name"
- create release diffs, "$diff_name"