Add a new 'FindNetCDF.cmake' file purposes to find the NetCDF library easily.

Download from url "https://raw.github.com/jedbrown/cmake-modules/master/FindNetCDF.cmake".

	new file:   config/cmake/FindNetCDF.cmake
Rewrite the 'FindNetCDF.cmake' script.

It provides 2 variablesi only:
	- NETCDF_INCLUDE_DIRS
	- NETCDF_LIBRARIES

	modified:   config/cmake/FindNetCDF.cmake
Add the NetCDF variable reading to this example.

This example extract convenient pr2 data from the NetCDF file.

	modified:   src/vtk/CMakeLists.txt
	modified:   src/vtk/vtk_example_04.cxx