Tristan Coulange authored Aug 21, 2015 and Mathieu Westphal (Kitware) committed Sep 29, 2015

This commit fixes bug 15671, which requested a tooltip feature

1. Generalize vtkSMInteractiveSelectionPipeline into vtkSMPreselectionPipeline
2. Create a vtkSMTooltipSelectionPipeline, inheriting from vtkSMPreselectionPipeline
   vtkSMTooltipSelectionPipeline uses vtkSMPreselectionPipeline to catch hoovering events on points
   and display under certain circumstances information about the hoovered points.
3. Adding a timer in pqRenderViewSelectionReaction in order to handle hoover events
4. Adding SELECT_SURFACE_POINTS_TOOLTIP case in pqRenderViewSelectionReaction
5. Adding Tooltip action in pqStandardViewFrameActionsImplementation