Reaction Toolkit Introduction:

New object type: Reaction.

• A reaction is made up of zero-or-more molecules.

• Can be made from scratch (dt_alloc_reaction(), dt_addcomponent()) or made from a SMILES (dt_smilin()).

  dt_alloc_reaction() => dt_Handle reaction
  dt_addcomponent(reaction, mol, role) => dt_Handle mol_copy
  dt_dealloc(mol) => dt_Boolean success

• dt_smilin() represents a slight variation on our polymorphism. Multiple object types are created in a function, based on the given input string.