bug: forced scaleup to always use supercell of 3, 3, 3
bug: forced scaleup to always use supercell of 3, 3, 3

Perhaps this may be changed later on, but it should suffice
for nearly all cases.

Signed-off-by: Nick Papior <81a73bca3d342ffee33d7cf845fdbf77b6553831@gmail.com>

zerothi/sisl,zerothi/sisl