Merge branch 'mm/config-edit-global'

Start "git config --edit --global" from a skeletal per-user configuration file contents, instead of a total blank, when the user does not already have any. This immediately reduces the need for a later "Have you forgotten setting core.user?" and we can add more to the template as we gain more experience. * mm/config-edit-global: commit: advertise config --global --edit on guessed identity home_config_paths(): let the caller ignore xdg path config --global --edit: create a template file if needed