* scripts/update-alternatives.{pl,8}:

* scripts/update-alternatives.{pl,8}:
  * Apply patch that provides --set and --remove-all commands.
  * --all calls --config on all alternatives.
* scripts/update-alternatives.pl:
  * Alter --config prompt, to be more clear, that one must 'press' enter to
    accept the default.
  * Fix some -w issues.
  * Check whether the target path exists when removing.