First round of patches to make it easier to work with the MainWindow

[Dirk Hohndel]

On Tue, Feb 10, 2015 at 12:36:34PM -0200, Tomaz Canabrava wrote:
> There are obvious bugs that i'm working on.
> most notably, it forgets the size of the widgets.

So do these get us back to a "mostly working" state? I don't want master
to be completely unusable...

/D