Rather than Config asking its (owning) ViewStep what the title
is -- all existing implementations have a prettyName() for that --
move the title into Config and re-do-the ViewSteps to use it.
Rename init() to something meaningful.
- the Page displays a simple message describing what the
summary is all about; Config has the same message,
use that. Needed some re-jigging to get the signals
and slots right.
