Change-Id: If25857b79d072ad890f0864c11660d3bb06817e0

VTK now exports all of its installed targets into a VTKTargets.cmake file. Inclusion of this file allows other projects to import VTK targets and reference them directly, in a simple and flexible manner.

Change-Id: Ifa501156a84be82fbc1e46de67e670de7ec2a99c

Just in case more than one sip.h exists on a system, make sure that
the one in SIP_INCLUDE_DIR takes priority over the one inside python's
include path.

This should improve build times for developers who turn VTK_USE_MPI and VTK_WRAP_PYTHON On/Off by only including python/mpi's include directory where necessary instead of at the top which will cause a complete rebuild of everything when toggleing these.

A new class called vtkPythonArgs has been added to simplify
the conversion of Python args to C++ args.  The vtkWrapPython.c
code has been refactored into several smaller functions.

Enhanced vtkWrapPython to recognized Qt types used in VTK classes.
Use SIP to wrap Qt classes for use with PyQt.
Also added bridge code to make VTK types work in Qt classes.

Organizationally, it makes more sense for the python utility classes
to be placed in Wrapping/Python than in Common.  This means adding a
new library called vtkPythonCore that represents the core python
support for VTK, as compared to VTK classes for individual kits like
Common/vtkPythonCommand.cxx and Rendering/vtkTkRenderWidgetPython.cxx.

Add three methods to the python vtk module to provide convenience
for creating, extracting values from, and casting values from
vtkVariant objects.

We cannot transitively link in FFMPEG through vtkIO we must link it directly if enabled.

We cannot transitively link in FFMPEG through vtkIO we must link it directly if enabled.

Thanks to Eric E. Monson for spotting the last few bits of Python
wrapping changes required to get the Charts kit installed and working
correctly.

Additions so that import vtk.charts works as expected, and as it does in
other VTK Python wrapped modules.

COMP: The new FindPythonLibs.cmake stores PY_STATIC_MODULES_LIST as a global property now.  This fixes a link error when building with static python modules.

ENH:  Added files and unit tests in VTK/Graphics for Matlab and Gnu R integration with VTK.  Added new advanced CMake options VTK_USE_MATLAB_MEX and VTK_USE_GNU_R to enable builds with Matlab and R.  Building the integration code requires a Matlab installation or an installation of GNU R compiled from source.  The integration files will be compiled with the vtkGraphics library.  Unit tests are located in VTK/Graphics/Testing/Cxx.  Python examples are located in VTK/Examples/Infovis/Python.

explicitly sets the MPI_LIBRARY and MPI_EXTRA_LIBRARY.

COMP: fix pvtkpython to link in MPI directly as it no longer can i get it transitively from other vtk libraries that also link to MPI.

install the python extension modules using setup.py, instead simply use CMake.
This may be needed by external projects (such as ParaView) that include VTK.