Fix signedness of data stored in registry layer.
Fix signedness of data stored in registry layer.

The registry stores DWORDS and QWORDS which are both unsigned types. Use
these to store QVariant::UInt and QVariant::ULongLong, respectively.
QVariant::Int and QVariant::LongLong are stored after serialisation.

KDE/android-qt-mobility,qtproject/qt-mobility,kaltsi/qt-mobility,kaltsi/qt-mobility,enthought/qt-mobility,KDE/android-qt-mobility,kaltsi/qt-mobility,tmcguire/qt-mobility,kaltsi/qt-mobility,tmcguire/qt-mobility,enthought/qt-mobility,qtproject/qt-mobility,tmcguire/qt-mobility,KDE/android-qt-mobility,qtproject/qt-mobility,qtproject/qt-mobility,KDE/android-qt-mobility,kaltsi/qt-mobility,kaltsi/qt-mobility,enthought/qt-mobility,tmcguire/qt-mobility,qtproject/qt-mobility,tmcguire/qt-mobility,enthought/qt-mobility,enthought/qt-mobility,enthought/qt-mobility,qtproject/qt-mobility