Add test for 64bit float openfoam files.

IO/Geometry/Testing/Cxx/CMakeLists.txt

IO/Geometry/Testing/Cxx/TestOpenFOAMReader64BitFloats.cxx

...sting/Data/Baseline/TestOpenFOAMReader64BitFloats.png.md5

Testing/Data/OpenFOAM/64BitFloats/0/U.md5

Testing/Data/OpenFOAM/64BitFloats/0/p.md5

.../Data/OpenFOAM/64BitFloats/constant/polyMesh/boundary.md5

...ing/Data/OpenFOAM/64BitFloats/constant/polyMesh/faces.md5

...Data/OpenFOAM/64BitFloats/constant/polyMesh/neighbour.md5

...ing/Data/OpenFOAM/64BitFloats/constant/polyMesh/owner.md5

...ng/Data/OpenFOAM/64BitFloats/constant/polyMesh/points.md5

Testing/Data/OpenFOAM/64BitFloats/system/controlDict.md5

Testing/Data/OpenFOAM/64BitFloats/test.foam.md5