Fixed indexing errors in Phase::addUniqueSpecies
Fixed indexing errors in Phase::addUniqueSpecies

Also simplified to eliminate unnecessary iterator usage and fixed a comment that
indicated exactly the opposite of what the function actually does.


Heathckliff/cantera,Heathckliff/cantera,Heathckliff/cantera,imitrichev/cantera,imitrichev/cantera,Heathckliff/cantera,imitrichev/cantera,imitrichev/cantera,Heathckliff/cantera,imitrichev/cantera,Heathckliff/cantera,imitrichev/cantera