Codestyle corrections

No line should exceed 120 characters.

https://bugzilla.gnome.org/show_bug.cgi?id=728930
Make submodule URL absolute

This makes life easier for people cloning from non-standard (not on
git.gnome) repositories.

https://bugzilla.gnome.org/show_bug.cgi?id=728948
wizard: add possibility to add a reset button
tmp