#773 Build Supercell Creates Duplicate Atoms

[Anonymous]

The workflow:
1) Import crystal -> black phosphorus -> 8 atoms get inserted, it is correct.
2) Build supercell -> insert any numbers. The supercell appears on the screen.
3) Export the structure, xyz

The error:
The exported structure contains a number of duplicate atoms (atoms with identical XYZ positions). I cannot predict the numbers of the wrong atoms, but they are not nearby. As a result, ab initio code crashes reporting distance zero between atom pairs. This problem appears only after the supercell creation, the unit cell works correctly.