Follow the keep-changes feature instead of its negation (in `pijul unrecord`)
Dependencies
- [2]
EUZFFJSOUpdating Pijul with the latest changes in Libpijul - [3]
GUL4M5FICleanup and formatting - [4]
MHQBEHJDunrecord --reset without a pending change - [5]
I24UEJQLVarious post-fire fixes - [6]
2RXOCWUWMaking libpijul deterministic (and getting rid of `rand`) - [*]
SXEYMYF7Fixing the bad changes in history (unfortunately, by rebooting).