Short options for pijul diff. This makes it possible to get unrecorded files using `pijul diff -su`.

Created by  FHRXP5Jnb2MWLDrPrnLnkN2ryWcGCo6CRr1dXR9FW2YA  on September 14, 2021
FO6DL4ETPXHILV7DQK54XP6SY4YUPG3NENRMKCDBU65WES6MKCHAC
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