Open directory DIR and create a default window configuration.
Convenience command that:
- Opens dired in folder DIR
- Splits windows in most useful (?) way
- Set `truncate-lines' to t
After the command has finished, you would typically mark some
image files in dired and type
M-x image-dired-display-thumbs (`image-dired-display-thumbs').
If called with prefix argument ARG, skip splitting of windows.
The current window configuration is saved and can be restored by
calling `image-dired-restore-window-configuration'. (fn DIR &optional ARG)