Added multi-model b_factor is added when importing from .pdb files via biotite #133 'Invert' field option to atom_properties and other selection nodes to optionally invert the selection Added better detection of ligands and modifcations (such as sugars) and a separate selection node for them. Currently ligands are stored on the res_name attribute, starting at 100 and incrementing one for each unique ligand. (should mostly address #79) Fixed include_bonds option was not being utilised on MD import #132 MOL_animate_res_wiggle was wiggling the OXT (res_name == 38) oxygen when a peptide chain ended. Added additional selection to not wiggle this atom, which should only ever appear when a peptide chain terminates. fixed import of vdw_radii for elements not supported by biotite (such as Fe) by moving vdw_radii to the data dictionary rather than relying on a function from biotite which had a limited dictionary for vdw_radii lookup