Added Python bindings (copied from tnl-mhfem)

src/Python/CMakeLists.txt

src/Python/pytnl/CMakeLists.txt

src/Python/pytnl/RawIterator.h

src/Python/pytnl/exceptions.h

src/Python/pytnl/tnl/Array.h

src/Python/pytnl/tnl/CMakeLists.txt

src/Python/pytnl/tnl/EntityTypes.h

src/Python/pytnl/tnl/Grid.h

src/Python/pytnl/tnl/Grid1D.cpp

src/Python/pytnl/tnl/Grid2D.cpp

src/Python/pytnl/tnl/Grid3D.cpp

src/Python/pytnl/tnl/Grid_getSpaceStepsProducts.h

src/Python/pytnl/tnl/Mesh.cpp

src/Python/pytnl/tnl/Mesh.h

src/Python/pytnl/tnl/Object.cpp

src/Python/pytnl/tnl/SparseMatrix.cpp

src/Python/pytnl/tnl/SparseMatrix.h

src/Python/pytnl/tnl/StaticVector.h

src/Python/pytnl/tnl/String.cpp

src/Python/pytnl/tnl/Vector.h