Brings in Python and QVTKOpenGLWidget fixes
Brings in Python and QVTKOpenGLWidget fixes

These are needed to move to Python 3, and to resolve some Qt5 issues
with rendering.

mathturtle/tomviz-superbuild,mathturtle/tomviz-superbuild,OpenChemistry/tomviz-superbuild,OpenChemistry/tomviz-superbuild,cjh1/tomviz-superbuild,cjh1/tomviz-superbuild