changed qt import. fixed some numpy deprecation warnings.

vviewer/AveragePlot.py

vviewer/ColorMapWidget.py

vviewer/FunctionalDialog.py

vviewer/Image.py

vviewer/Image4D.py

vviewer/ImageDialog.py

vviewer/ImageItemMod.py

vviewer/JumpSlider.py

vviewer/MosaicDialog.py

vviewer/MosaicSliceBox.py

vviewer/MosaicView.py

vviewer/SettingsDialog.py

vviewer/SingleSlice.py

vviewer/SliceBox.py

vviewer/SliceWidget.py

vviewer/SliceWindow.py

vviewer/ValueWindow.py

vviewer/loadImage.py

vviewer/python2_3.py

vviewer/qt_console_widget.py