- There is an RAII wrapper called ScopedInitializer to handle
  finalization due to C++ exceptions and to avoid calls to Finalize in
  all exit branches.
- Fixed signature of MpiCommunicator::Init to match that of MPI_Init.

This shuts up a lot of GCC warnings...

This is closer to value_type which is used in STL containers.

The link provided in the comment is not related - tnl-cuda-arch is not
built as a static binary.

Anyway, I don't see any problem with this. Either fix it properly or at
least file a full bug report on Gitlab. Upgrading cmake on your system
might also help...

Build of tools can be turned-off. Grid traversers for 1D and 2D has been rewritten using subdomain overlaps.

It should not be called "base" because inheritance does not work for the
constexpr methods.