Xml annotation develop


![user4-xml](https://f.cloud.github.com/assets/1022396/384971/cb151fb6-a66e-11e2-9b78-899299dc68a9.png)
Same as #1024 but now onto ```develop```
Handle XML annotation and other type to  test the PR

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.