ENH: Add test for vtkOpenFOAMReader

IO/Geometry/Testing/Cxx/CMakeLists.txt

IO/Geometry/Testing/Cxx/TestOpenFOAMReader.cxx

IO/Geometry/Testing/Data/Baseline/TestOpenFOAMReader.png.md5

Testing/Data/OpenFOAM/cavity/._.DS_Store.md5

Testing/Data/OpenFOAM/cavity/._cavity.foam.md5

Testing/Data/OpenFOAM/cavity/0.5/._U.md5

Testing/Data/OpenFOAM/cavity/0.5/._p.md5

Testing/Data/OpenFOAM/cavity/0.5/._phi.md5

Testing/Data/OpenFOAM/cavity/0.5/U.md5

Testing/Data/OpenFOAM/cavity/0.5/p.md5

Testing/Data/OpenFOAM/cavity/0.5/phi.md5

Testing/Data/OpenFOAM/cavity/0.5/uniform/._time.md5

Testing/Data/OpenFOAM/cavity/0.5/uniform/time.md5

Testing/Data/OpenFOAM/cavity/0/._U.md5

Testing/Data/OpenFOAM/cavity/0/._p.md5

Testing/Data/OpenFOAM/cavity/0/U.md5

Testing/Data/OpenFOAM/cavity/0/p.md5

Testing/Data/OpenFOAM/cavity/1.5/._U.md5

Testing/Data/OpenFOAM/cavity/1.5/._p.md5

Testing/Data/OpenFOAM/cavity/1.5/._phi.md5