correct wrapping empty specie
fix twise wrapping empty specie
add simple tests for #symmetrics of atoms_sequence
fix separation of cross_bridge_on_bridges to two methyl_on_bridge
add #all_twins behaviour to spec residual
correct symmetrics find algorythm
erase EmptySpeciesCounter
intermediate fix original sequence
fix find symmetric logic for bottom_hydrogenated_activated_dimer
erase #back_twins and todo comments...
fix combination of original sequence by parent sequences