ENH: Added axis rescaling when close to the ends.
ENH: Added axis rescaling when close to the ends.

If the user clicks close to the ends of the axes then they can be
interactively rescaled. This may not be the right mouse button, and some
visual cues are needed to make this more discoverable.

cjh1/VTK,hendradarwin/VTK,ashray/VTK-EVM,johnkit/vtk-dev,hendradarwin/VTK,jeffbaumes/jeffbaumes-vtk,sankhesh/VTK,berendkleinhaneveld/VTK,berendkleinhaneveld/VTK,arnaudgelas/VTK,cjh1/VTK,sankhesh/VTK,collects/VTK,jeffbaumes/jeffbaumes-vtk,aashish24/VTK-old,demarle/VTK,keithroe/vtkoptix,naucoin/VTKSlicerWidgets,gram526/VTK,daviddoria/PointGraphsPhase1,sumedhasingla/VTK,arnaudgelas/VTK,hendradarwin/VTK,hendradarwin/VTK,daviddoria/PointGraphsPhase1,ashray/VTK-EVM,demarle/VTK,johnkit/vtk-dev,SimVascular/VTK,ashray/VTK-EVM,sankhesh/VTK,mspark93/VTK,arnaudgelas/VTK,Wuteyan/VTK,sumedhasingla/VTK,jeffbaumes/jeffbaumes-vtk,SimVascular/VTK,mspark93/VTK,naucoin/VTKSlicerWidgets,biddisco/VTK,ashray/VTK-EVM,jeffbaumes/jeffbaumes-vtk,arnaudgelas/VTK,johnkit/vtk-dev,naucoin/VTKSlicerWidgets,keithroe/vtkoptix,johnkit/vtk-dev,sumedhasingla/VTK,johnkit/vtk-dev,Wuteyan/VTK,Wuteyan/VTK,msmolens/VTK,candy7393/VTK,hendradarwin/VTK,cjh1/VTK,msmolens/VTK,arnaudgelas/VTK,ashray/VTK-EVM,gram526/VTK,sankhesh/VTK,aashish24/VTK-old,SimVascular/VTK,candy7393/VTK,aashish24/VTK-old,collects/VTK,demarle/VTK,johnkit/vtk-dev,biddisco/VTK,daviddoria/PointGraphsPhase1,berendkleinhaneveld/VTK,jeffbaumes/jeffbaumes-vtk,sankhesh/VTK,arnaudgelas/VTK,candy7393/VTK,keithroe/vtkoptix,hendradarwin/VTK,sumedhasingla/VTK,biddisco/VTK,biddisco/VTK,sumedhasingla/VTK,SimVascular/VTK,spthaolt/VTK,cjh1/VTK,berendkleinhaneveld/VTK,keithroe/vtkoptix,mspark93/VTK,candy7393/VTK,gram526/VTK,msmolens/VTK,naucoin/VTKSlicerWidgets,collects/VTK,Wuteyan/VTK,demarle/VTK,jmerkow/VTK,gram526/VTK,keithroe/vtkoptix,gram526/VTK,msmolens/VTK,ashray/VTK-EVM,naucoin/VTKSlicerWidgets,berendkleinhaneveld/VTK,spthaolt/VTK,candy7393/VTK,msmolens/VTK,keithroe/vtkoptix,collects/VTK,gram526/VTK,sumedhasingla/VTK,biddisco/VTK,candy7393/VTK,daviddoria/PointGraphsPhase1,demarle/VTK,jmerkow/VTK,mspark93/VTK,Wuteyan/VTK,Wuteyan/VTK,demarle/VTK,johnkit/vtk-dev,keithroe/vtkoptix,Wuteyan/VTK,keithroe/vtkoptix,hendradarwin/VTK,mspark93/VTK,jmerkow/VTK,jeffbaumes/jeffbaumes-vtk,SimVascular/VTK,sumedhasingla/VTK,jmerkow/VTK,SimVascular/VTK,cjh1/VTK,msmolens/VTK,ashray/VTK-EVM,demarle/VTK,SimVascular/VTK,jmerkow/VTK,biddisco/VTK,aashish24/VTK-old,collects/VTK,spthaolt/VTK,spthaolt/VTK,jmerkow/VTK,SimVascular/VTK,cjh1/VTK,daviddoria/PointGraphsPhase1,aashish24/VTK-old,sumedhasingla/VTK,spthaolt/VTK,mspark93/VTK,mspark93/VTK,sankhesh/VTK,ashray/VTK-EVM,candy7393/VTK,msmolens/VTK,candy7393/VTK,demarle/VTK,jmerkow/VTK,sankhesh/VTK,spthaolt/VTK,biddisco/VTK,aashish24/VTK-old,msmolens/VTK,gram526/VTK,spthaolt/VTK,mspark93/VTK,gram526/VTK,jmerkow/VTK,daviddoria/PointGraphsPhase1,naucoin/VTKSlicerWidgets,berendkleinhaneveld/VTK,sankhesh/VTK,berendkleinhaneveld/VTK,collects/VTK