updated examples XML

preparing a new release candidate

fix checkable WMenuItem event handling

several bug fixes and small feature improvements (see Changelog)

updated Changelog

applied patch from Stefan Ruppert (#1470)

code cleanups, fix layout in dialog behaviour with maximum width set

no release date yet

layout: fix issue when used inside a WGroupBox, fix uninitalized valu…

…e in WCartesianChart, and documentation updates

layout: fix issue when used inside a WGroupBox, fix uninitalized valu…

…e in WCartesianChart, and documentation updates