The sound distributed version control system

Update `pijul/src/main.rs` to use new identity management

A very small change that also adds backtrace printing support for ease of debugging

Created by  finchie  on August 16, 2022
TI7PCK7JLPU4KYE65XIMBUPPY7DRPVDAETPDFMG3VAQGGDRGQHPQC
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