Do not add reverse reaction if it already exists.

If forward reaction has the same template, then do not include it; if not, then
we have found an additional transition state and the reaction should be included.
Do not include any reverse reactions if the family has its own reverse otherwise
we are including kinetics for more than one direction.

rmgpy/rmg/model.py

@@ -478,13 +478,12 @@ def checkForExistingReaction(self, rxn):
         # Now use short-list to check for matches. All should be in same forward direction.
         for rxn0 in my_reactionList:
             if (rxn0.reactants == rxn.reactants and rxn0.products == rxn.products):
-                if rxn0.template == rxn.template:
+                if set(rxn0.template) == set(rxn.template):
                     return True, rxn0
 
             if isinstance(family,KineticsFamily) and family.ownReverse:
                 if (rxn0.reactants == rxn.products and rxn0.products == rxn.reactants):
-                    if rxn0.template == rxn.template:
-                        return True, rxn0
+                    return True, rxn0
 
         # Now check seed mechanisms
         # We want to check for duplicates in *other* seed mechanisms, but allow