v0.4.0 - Change default behavior of repodata files handling. (RhBug: 1094539) See: https://github.com/Tojaj/createrepo_c/wiki/New-File-Handling By default, createrepo leaves old groupfiles (comps files) in the repodata/ directory during update. Createrepo_c did the same thing but the version 0.4.0 changes this behaviour.