Changelog

Improve FloatingWidget (Remove maximize button, only support close-button which hides the widget)
Serialize and Deserialize state/size/positions of dockings
Make compatible with Qt 4.5 (ROFL!)
Save and restore FloatingWidget states
Restore: Manage new or deleted SectionContent objects, which are not available
Working with outer-edge-drops sometimes leaves empty splitters #BUG
Clean up of unused e.g. count()<=1 QSplitters doesn't work well #BUG
Show close button on right corner of SectionWidget. How to safe last section position?
Serialize state of _hiddenSectionContents
Add "title" to SectionContent object, which will be used in visible areas to display contents name.
It should be possible to catch the "activeTabChanged" signal for EXTERN_API users
Add API function to set an SC as active-tab
Move all lookup maps into ContainterWidget as non-static members, otherwise we can not have the same SC name inside another ContainerWidget instance.
The uniqueness of a SectionContainer needs to be restricted to its parent ContainerWidget, not global!

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