When signing commits with `jj sign`, one might want to use a workflow
like:
```bash
jj fix && jj sign .. && jj git push
```
Making the default value for `-r`/`--revisions` configurable, will allow
such a workflow.
Co-Authored-By: Yuya Nishihara <yuya@tcha.org>
The output of `jj unsign` is based on that of `jj abandon`.
We output warnings when unsigning commits, which are not authored by the
user. This is encouraging to use `jj undo`, in case one unintentionally
drops signatures of others.
---
Co-authored-by: julienvincent <m@julienvincent.io>
Co-authored-by: necauqua <him@necauq.ua>