It's possible to ignore the "user setting" for restart-now
and call doRestart(true) directly. This is intended for
use with specific UIs that make that choice clear for the user.
Hook up both [finished] and [finishedq] to the "traditional"
restart-if-the-box-is-ticked logic although the example
QML doesn't expose that box.
- move most of the business logic to Config
- make retranslate of the page more robust (e.g. changing language
after failure would restore the un-failed message)
There's still some bits left.
