Update VTK to bring fixes for string arrays.

Change-Id: Ie6d825b21b8d4aede038d49a5b8c26cae7336d24
Update PythonAnnotationFilter.

Updating PythonAnnotationFilter to work with newer numpy support. Since
the calculator.py API was changed, updating extract_selection module as
well.

Change-Id: I3fe663455b506bd75e7452773af8fab23c0dc422
Merge topic 'fix_find_data' into next

78e7ff7e Update PythonAnnotationFilter.
f9d53e7d Update VTK to bring fixes for string arrays.