Save mode visibility in a separate property.

Instead of using the actual visibility state of the widget, which might
have screwed things up if for some reason the widget itself was not
visible the moment settings are saved.

Change-Id: I7ae89259dc925f799bca413b537b65e9e689e1b7
Reviewed-by: Jarek Kobus <jaroslaw.kobus@digia.com>
Debugger: Suppress listing __PRETTY_FUNCTION__

It's visible in the stack view anyway an make auto-resizing of
the L&E view ugly due to its length.

Change-Id: I722eb03fe0ddcb193ed8d45e672564f7113b662f
Reviewed-by: hjk <hjk121@nokiamail.com>
Debugger: Move warning of insufficent python version

It was in exactly the wrong branch.

Change-Id: I0679c18dc9c049bb89c2cba47cb0762ad81e3024
Reviewed-by: hjk <hjk121@nokiamail.com>