revert: add support for reverting subrepos without --no-backup and/or --all When a subrepo is reverted but --no-backup is not set, call revert on the subrepo that is being reverted prior to updating it to the revision specified in the parent repo's .hgsubstate file. The --all flag is passed down to the subrepo when it is being reverted. If the --all flag is not set, all files that are modified on the subrepo will be reverted.