Install Midnight Commander on XigmaNAS (embedded version)

1. Keep this script in its own directory.
2. chmod the script u+x,
3. Always run this script using the full path: /mnt/.../directory/mcommander.sh
4. You can add this script to WebGUI: Advanced: Command Scripts as a PostInit command (see 3).
5. To run Midnight Commander from shell type 'mc'.