Xml annotation

Handle XML annotation and other type to  test the PR
Log as user 4 

See screenshot to select the image with XML annotation
* Mouse over the annotation. Check that the tooltip indicates the owner and the annotator
* click on the menu icon. 
* Click on the Edit button. Change the content (no xml validation)
* Click on the info button.
* Click on the Unlink button. Make sure the annotation is unlinked.
* Select another image. Make sure that a dialog does not pop up indicating "Do you want to save?"
* go back to the image with XML annotation
* click on the minus button next to Other
* All other annotations should be removed.

![XMLAnnotation](https://f.cloud.github.com/assets/1022396/370132/b52c5b08-a2e8-11e2-85fc-02268dc265bf.png)