This way we can build with CUDA, Clang and MPI at the same time

unsigned int cannot hold a value of 0.5, it was probably meant to wait
0.5 seconds, i.e. 0.5e6 microseconds.

[ci skip]

The code for explicit template instantiation was already removed anyway...

Also, templates were reordered so that related functions are next to
each other.

It is already defined in VectorViewExpressions.h