Enable wizard title on the left instead of on top (bnc#868859).

It will be used for the installation.
moved the Release Notes button to the right of Help

otherwise it would follow the title to the left pane
version + changelog
Use a proper API instead of an environment variable.
Merge pull request #31 from libyui/title-left

Enable wizard title on the left instead of on top (bnc#868859)
Improve styleability of dialog heading
Merge pull request #32 from tgoettlicher/master

Improve styleability of dialog heading