Comment 5 for bug 1197727

Sebastian, I've adjusted the design based on your comments:
- the question is more explicit because it's in the primary text
- the options use radio buttons rather than just clickable text fields
- the alert is now resizable.

It's true that "Continue" looks weird on its own, but that's an inevitable side-effect of dpkg operations not being cancellable. If that was fixed, this dialog could get a Cancel button.