trigger on self deinstall
It would be nice to have the ability to run a trigger when the package providing the trigger is uninstalled.
This would allow trigger scripts to clean up the files they created. Eg. the mkinitfs trigger could remove the initramfs files.
The script would need to check for that case when it uses files provided by the package (eg. a command) since they won't be available in that case. To not break old scripts this could be implemented as an additional flag.