change/fix real space 3D models for Pyramid2

Pyramid2 uses Column model now and always has one top vertex even if L!=W.

look into https://bornagainproject.org/git-develop/ref/sample/particle/ff/hard/pyramid2/ for better explanation how it should behave.

Update: problem has been identified that something in libformfactor needs to be changed. As of right now, increasing length will increase both length and width, which should not be the case.