QTAIM Extension

Hi,

what is the QTAIM extension for in 1.1? (OK, wikipedia tells me it
stands for “quantum theory of atoms in molecules”) Is it well known
enough to most users so they don’t need more explanation? The three
subitems for the QTAIM extension are not very descriptive either (at
least with respect to “QTAIM”) and they just want to open files.

It tries to load .wfn files, but there are none of those in testfiles/,
I think it would be good if at least one testfile could be added so
users can try it out.

Michael