Overview of changes
- Add a reset command
- Document requirements for distro support
- Don't use a toolbox container until after it has been configured
- Drop the coloured heading from 'list'
- Miscellaneous fixes to Bash completion
- Remove the hidden --sudo option and the /etc/sudoers.d snippet
- Try to migrate to a supported OCI runtime if 'podman start' suggests so
- Unbreak 'run' if container lacks files that are redirected to the host