Spherical harmonics. Almost everyhing is done. Missing triangle area calculation when vertex is moved or bond is flipped. Also missing volume calculation on vertex move or bondflip. Calculation of co coefficient is not done completely yet. Problems are in numbering the coefficients. Newly added data structure ts_spharm is referenced from ts_vesicle. Missing function for initialization and freeing the memory of that datastructure -- but that memory is already used by some functions.