Create a new HDF5 group without linking it into a file
H5Gcreate_anon(h5loc)An object of class H5IdComponent specifying the file in which the new group is to be created.
H5Gcreate_anon returns an object of class H5IdComponent
representing the newly created group. However at this point is is still
anonymous, and must be linked into the file structure via H5Olink().
If this is not done, the group will be deleted from the file when it
is closed.