UISliderWidget to have a QDoubleSpinBox attached

[paskino]

The UISliderWidget would benefit of having a QDoubleSpinBox attached so that one could set the selected value manually. Currently there is nothing except a QLabel which must be passed by the user, which is pretty useless.

eqt/eqt/ui/UISliderWidget.py

Lines 9 to 11 in 8ac20be

	def __init__(self, label, scale_factor=1):
	QSlider.__init__(self)
	self.label = label

[DanicaSTFC]

This issue can be looked at together with #60