cmake: replace PYTHON_INCLUDE_PATH with PYTHON_INCLUDE_DIR

VTK's FindPythonLibs.cmake removed this (deprecated) variable.

Change-Id: Ie945e26110dcac46c773916ac8573d0fb0cfd634
Merge topic 'remove-python-include-path' into next

820e74b1 cmake: replace PYTHON_INCLUDE_PATH with PYTHON_INCLUDE_DIR
Update VTK to current master

Change-Id: Ice89855360895392b42e44b1dc32189b31046305
Merge topic 'fix-xml-crash-on-close' into next

b82c6fa5 Update VTK to current master
update vtk

Change-Id: I9473cfcc44c120032cc8a4a7ef2d05156d75eb21
Merge topic 'update-vtk-20141030' into next

58dedb20 update vtk