COMP: Update VTK project to re-add support for additional call data types

Following r22898, the version of VTK has been changed to use the
branch named "slicer-release-5.10_2014-01-20". When initially created,
it didn't include the improvement to the CallDataType support. This commit
fixes this by including the following to commit into the SlicerVTK fork:

$ git shortlog e7464be93..4e0ca68
Jean-Christophe Fillion-Robin (2):
      vtkPythonCommand - Add support for additional call data types
      vtkPythonCommand - Fix indent and variable names

Note that this commit have already been contributed and integrated
into VTK6.
See http://review.source.kitware.com/#/t/3966
and https://github.com/Kitware/VTK/commit/3a2a3ce595daab0bc2a9f858ef593905fd77a9ce

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22911 3bd1e089-480b-0410-8dfb-8563597acbee