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There's no need to duplicate code when we can wrap the binding
between the UI widget and the Connection property by having an
specialized Property object.

I can't see a reason why not. :)

- Any pending deletions upon exit are now processed
- A timeout is added for non-auth notifications

Fixes #30

Users will want to copy this to paste somewhere else.

It makes more sense to have read-only properties out of the listbox
and only the editable options in it.

This is what we do in Boxes too. Much more intuitive to indicate
what's being managed.

Closes #31

Fixes #18

Back when I initially proposed this app, we were in doubt whether
it would make sense to have such application being part of the core
set of GNOME apps. For this reason I attempted to remove most of
the GNOME branding from it until a decision was reached.

Now we are a GNOME app and we are better off telling the world
about it. :)

Fixes #24