add -0 for outputting null-terminated list (#68)
* add -0 for outputting null-terminated list this doesn't add much, if any, additional complexity to the codebase and can be quite handy for scripting purposes. Closes: https://github.com/nsxiv/nsxiv/issues/67 * Fix typo Co-authored-by: Berke Kocaoğlu <berke.kocaoglu@metu.edu.tr>
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