MC polybeads

Force Field: so far just masses, and nonbonded interactions (LJ,exp-6)

atom_prop structure removed and replaced by atom_rel[i_atom]
   (the relative index of a given i_atom is the only info needed
    in the builder).

mol_prop structure removed and replaced by mol_first_atm[i_mol]
   (the label of the first atom of a given i_mol is the only info 
    needed in the builder)

template_bonds structure removed and replaced by 3 arrays temp_bonds_1,
                                                          temp_bonds_2,
                                                          temp_bonds_ord
    (only temp_bonds_1 and temp_bonds_2 are used - in graphics only!)

combine strructure removed and replaced by an array combine[][][][]
   which contains only the overlap term (only thing used in the builder)

template_atoms structure removed and replaced by 9 arrays :
                                    temp_atm_pos[][][x,y,z]
				    temp_atm_mass[][]
				    temp_atm_lab[][]
				    temp_atm_type[][][]
				    temp_atm_nbr[][]
				    temp_atm_br[][][6]
				    temp_atm_ord[][][6]
				    temp_atm_sigma[][]
				    temp_atm_eps[][]
