vector → labeling Relation

File in src/gui/vector	Includes file in src/gui/labeling
qgsdiagramwidget.cpp	qgslabelengineconfigdialog.h
qgsstackeddiagramproperties.cpp	qgslabelengineconfigdialog.h
qgsvectorlayerproperties.cpp	qgslabelinggui.h
qgsvectorlayerproperties.cpp	qgslabelingwidget.h