Fix for the ellipsoid() function for the new param_types == 3 (Dxx, Dyy, Dzz, Dxy, Dxz, Dyz) data.
The ordering Dx <= Dy <= Dz was not being used so the rhombicity was incorrectly calculated.
Authored by: bugman 2010-03-16
Parent: [r11014]
Child: [r11016]
