This is convenience program to pull/restore backup data for a GitLab
instance into/from git-backup managed repository.

Backup layout is:

    gitlab/misc   - db + uploads + ...
    gitlab/repo   - git repositories

On restoration we extract repositories into
.../git-data/repositories.<timestamp> and db backup into standard gitlab
backup tar and advice user how to proceed with exact finishing commands.

This will hopefully be improved and changed to finish automatically,
after some testing.