Add a title label to the pages. Use QGroupBoxes throughout.
Extend SavedAction to work with checkable QGroupBoxes. Polish UI files,
use common layout for VCS plugins. Performance: Apply only visited
settings pages. Add search keywords.
Task-number: QTCREATOR-26
- show side-by-side if possible
- always show side-by-side
- always show full help
The default is "show side-by-side if possible". It's currently considered
possible if the editor is at least 800 pixels wide.