Changes:
- math Added Coxeter plane projections (still crashes on some algebras though).
- math Added (dual) Coxeter labels and numbers for affine and finite algebras.
- ui Added option to sort Dynkin diagram nodes from bottom to top, or the other way around.
- ui Switched from 3D Hasse diagram to 2D Hasse diagrams.
- ui Added EPS export capability of root system projections and Dynkin diagrams (the LaTeX export has been removed).
- misc Various bug-fixes and improvements.