Gridder: add automatic selection of index type
Currently, we use
uint32_t to store the indices of visibilities we want to grid/degrid. For very large measurement sets, this may not be enough (everything under 1 billion visibilities should be safe though).
It's possible to make
Tidx a template parameter and call code with
Tidx=uint64_t for really large MS without any user interaction. This increases compiled code size a bit, but that should not be a problem.