Using aspell in shell scripts, we may want to exit the script early depending on how the `aspell check` turned out. Exit with success is sensible after the user stepped through the whole file, and also after `x`-exiting. However, when `b`-aborting we would expect an exit with error. Unfortunately, `aspell check` seems to _always_ exit with success. Please change this behaviour, or add an option (`--abort-is-error`?) so users can change the behaviour if needed.