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* demo/viewer/browser_widget.cc, * demo/viewer/browser_widget.hh: Add arrows to change image and keep XML step. * demo/viewer/key_widget.cc, * demo/viewer/key_widget.hh: Change ListWidget to TreeWidget, Items can be disabled/enabled in groups. * demo/viewer/step_widget.cc, * demo/viewer/step_widget.hh: Small changes to keep the step when next/prev. picture is chosen. * demo/viewer/viewer.cc, * demo/viewer/xml_widget.cc: Layout adjustement.
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