[ntuple, doc] Write-up mapping of C++ types to fields and columns
[ntuple, doc] Write-up mapping of C++ types to fields and columns

olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root