Use vtkQtView as a base class for all vtkQtXXXViews.

 - Add record and column views types.

 - Update examples that use qt views.

 - Update paraview bar chart to use the new API.

 - Update OverView plugins that use qt views.

 - Update test using qt views.

 - Changing GetChartWidget to GetWidget.

 - Adding stubs for getting chart options for stacked chart and
   statistical box plot.