message: Use the new --noh flag in Open Babel 3.0.1 and later
  Ensures hydrogens are not added automatically.
  Fixes (and probably other issues)
diff: @@ -308,6 +308,7 @@ bool OBProcess::optimizeGeometry(const QByteArray& mol,
  realOptions << "-imol"
  << "-omol"
  << "--minimize"
  + << "--noh" # new in OB 3.0.1
  << "--log" << options;
  // We'll need to read the log (printed to stderr) to update progress
  