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C++ reserves all names starting with `_X` for some capital letter `X`.
Instead, use `CUBISM_` prefix.
Cubism still accepts all macros, but pops out a warning if used.

Instead of using _BLOCKSIZE*_ macros, use Block::sizeX/Y/Z.
Slice dumper currently is not implemented for non-cubical blocks.
pack/unpack functions get block size as a runtime argument, which
shouldn't really affect performance.

In tests, avoid _Capitalized, as that formatting is reserved by C++.

Removing _HDF5_DOUBLE_PRECISION_ from the library.

It was used only by the old coupling framework examples.
Now we require the user app to specify the Block class by itself.

User app must specify `Block::Real` and `ElementType::Real`.

Implemented using a #define trick I saw in pybind11.
If necessary we can a) change the namespace name, b) get rid of defines.

Wrong file offsets were aliasing memory addresses which cause corrupted
data and partial serialization of file write operations.

template<typename TGrid, typename TStreamer> should be
template<typename TStreamer, typename TGrid>

They are defined in their own namespaces.  More general this way.