Fix population order so DENEX comes after DENOM

#### Story ####
- https://www.pivotaltracker.com/story/show/67692192

#### Notes ####
- updated constants to reorder population codes, thereby enforcing application-wide reordering of DENEX to be after DENOM

#### Screenshot ####
![screen shot 2014-03-20 at 11 08 34 am](https://f.cloud.github.com/assets/456952/2473520/ff4a8662-b041-11e3-8101-681ef9ca50f8.png)