Adding a dummy field for display the citproc of the biblio.

![biblio settings site install](https://f.cloud.github.com/assets/1222368/1877542/263e4812-7929-11e3-8362-155a4b6c4280.png)
![booklet site install](https://f.cloud.github.com/assets/1222368/1877543/26593848-7929-11e3-9219-45a0a32bcb31.png)