Added missing python_view.py file

Change-Id: I3be09bad30f0d4239170ce85916dbf2301a5cd44
Added check for null instance of vtkMatplotlibUtilities

This prevents a crash if matplotlib is not available on the system.

Change-Id: Ie371c3d6a44addd09f86fbd9323cc99221e0454b
Matplotlib must now be enabled to expose the Python View

Tests are now disabled if matplotlib is not available at build time.

Change-Id: Id0298858467851a03504cdab2a701d46423a2ab4
Merge topic 'PythonView' into next

fe429d9 Matplotlib must now be enabled to expose the Python View
53e15d0 Added check for null instance of vtkMatplotlibUtilities
a1a8d78 Added missing python_view.py file
Fixed hidden virtual function warning

Change-Id: Ia36c8f1707f09d13390caffc826173b90b14c590
Merge topic 'PythonView' into next

d96e7b6 Fixed hidden virtual function warning
Endianes of system is determined by CMake.

Change-Id: Iba334dda7551952e13a51aa26f1abe2211a3bc63
Merge topic '14240_mac_endianness' into next

ccc21c9 Endianes of system is determined by CMake.