message: import obabel elementas
diff: #include <openbabel/mol.h>
  #include <openbabel/atom.h>
  #include <openbabel/bond.h>
  +#include <openbabel/elements.h>
  #include <boost/unordered_map.hpp>
  #include <exception>
  @@ -146,7 +147,7 @@ void FlexInfo::checkResidue(OpenBabel::OBResidue* residue)
  // TODO: Update with OBResidue::GetNumHvyAtoms() [openbabel#2299]
  unsigned int num_hvy_atoms = 0;
  - for (auto atom = residue->CBeginAtoms(); atom != residue->CEndAtoms(); atom++)
  + for (auto atom = residue->BeginAtoms(); atom != residue->EndAtoms(); atom++)
  {
  if ((*atom)->GetAtomicNum() != OBElements::Hydrogen)
  {
  