Bug #26


Adding more than one complaint for an OPD visit, wrongly raises an
"Duplicate Complaint" error

![new complaint success](https://cloud.githubusercontent.com/assets/5061506/4967130/120701ac-67fa-11e4-86a9-560ca6d56d51.JPG)
![same complaint error](https://cloud.githubusercontent.com/assets/5061506/4967133/36c1c23e-67fa-11e4-8820-dcd12be265f6.JPG)