Don't let tabs grab focus on press

Tab buttons should never take focus when pressed, but only pass
on focus to their child items. Tab focus should only get
focus when they are tabbed into.

Autotest is updated.

Change-Id: I0edad4d893be7ed7066d3a3631ca340e9bf8cb53
Reviewed-by: Liang Qi <liang.qi@digia.com>
Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@digia.com>
Add overview documentation for Qt Quick Layouts

Change-Id: I79df2abca1de42496f75fc08a779203a406ce155
Reviewed-by: Nico Vertriest <nico.vertriest@digia.com>
Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@digia.com>
Updated activation signals in TableView

- Added row property to activated()
- Added clicked(row) signal
- Added doubleClicked(row) signal

- We also fixed the behavior so that we do not emit activated
if the user clicks outside of the available rows.

- We fixed a problem where key events would not be seen outside
of the control

Change-Id: I13feba26e900daf85be7be88216f1a0a4a446c57
Reviewed-by: J-P Nurmi <jpnurmi@digia.com>