Resolve "Supercell enumeration yields equivalent supercells for 2D systems"
requested to merge 466-generate_target_structure-and-enumerate_supercells-fails-for-surface-slabs into master
There was a transpose missing in one formula, which screwed things up for 2D systems (and perhaps for 3D as well, not sure). This MR fixes that and simplifies a few other lines involving transposes.
Closes #466 (closed)