High-level interface to the Daylight toolkit

  >>> from daylight import Smiles, Smarts
  >>> mol = Smiles.smilin("c1ccccc1O")
  >>> for atom in mol.atoms:
  ...     print atom.symbol, len(atom.bonds)
  c 2
  c 2
  c 2
  c 2
  c 2
  c 3
  O 1
  >>>