Revert "Filling the ellipsoid methods and a bit of refactoring"
Filling Ellipsoid methods in EllipsoidAtom.h and EllipsoidAtom.cxx files. The refactoring part refers to the use of static methods, i.e get ellipsoid parameters, these static methods are used in diffusion code and also called inside ellipsoid class methods. Compiling code. This reverts commit 625b50ed.